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modify_scc.go
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modify_scc.go
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package policy
import (
"errors"
"fmt"
"github.com/spf13/cobra"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
kcmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/genericclioptions"
"k8s.io/kubernetes/pkg/kubectl/genericclioptions/printers"
"k8s.io/kubernetes/pkg/kubectl/scheme"
securityv1typedclient "github.com/openshift/client-go/security/clientset/versioned/typed/security/v1"
)
const (
AddSCCToGroupRecommendedName = "add-scc-to-group"
AddSCCToUserRecommendedName = "add-scc-to-user"
RemoveSCCFromGroupRecommendedName = "remove-scc-from-group"
RemoveSCCFromUserRecommendedName = "remove-scc-from-user"
)
var (
addSCCToUserExample = templates.Examples(`
# Add the 'restricted' security context contraint to user1 and user2
%[1]s restricted user1 user2
# Add the 'privileged' security context contraint to the service account serviceaccount1 in the current namespace
%[1]s privileged -z serviceaccount1`)
addSCCToGroupExample = templates.Examples(`
# Add the 'restricted' security context contraint to group1 and group2
%[1]s restricted group1 group2`)
)
type SCCModificationOptions struct {
PrintFlags *genericclioptions.PrintFlags
ToPrinter func(string) (printers.ResourcePrinter, error)
SCCName string
SCCInterface securityv1typedclient.SecurityContextConstraintsInterface
SANames []string
DefaultSubjectNamespace string
Subjects []corev1.ObjectReference
IsGroup bool
DryRun bool
Output string
genericclioptions.IOStreams
}
func NewSCCModificationOptions(streams genericclioptions.IOStreams) *SCCModificationOptions {
return &SCCModificationOptions{
PrintFlags: genericclioptions.NewPrintFlags("added to").WithTypeSetter(scheme.Scheme),
IOStreams: streams,
}
}
func NewCmdAddSCCToGroup(name, fullName string, f kcmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
o := NewSCCModificationOptions(streams)
cmd := &cobra.Command{
Use: name + " SCC GROUP [GROUP ...]",
Short: "Add security context constraint to groups",
Long: `Add security context constraint to groups`,
Example: fmt.Sprintf(addSCCToGroupExample, fullName),
Run: func(cmd *cobra.Command, args []string) {
kcmdutil.CheckErr(o.CompleteGroups(f, cmd, args))
kcmdutil.CheckErr(o.AddSCC())
},
}
kcmdutil.AddDryRunFlag(cmd)
o.PrintFlags.AddFlags(cmd)
return cmd
}
func NewCmdAddSCCToUser(name, fullName string, f kcmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
o := NewSCCModificationOptions(streams)
o.SANames = []string{}
cmd := &cobra.Command{
Use: name + " SCC (USER | -z SERVICEACCOUNT) [USER ...]",
Short: "Add security context constraint to users or a service account",
Long: `Add security context constraint to users or a service account`,
Example: fmt.Sprintf(addSCCToUserExample, fullName),
Run: func(cmd *cobra.Command, args []string) {
kcmdutil.CheckErr(o.CompleteUsers(f, cmd, args))
kcmdutil.CheckErr(o.AddSCC())
},
}
cmd.Flags().StringSliceVarP(&o.SANames, "serviceaccount", "z", o.SANames, "service account in the current namespace to use as a user")
kcmdutil.AddDryRunFlag(cmd)
o.PrintFlags.AddFlags(cmd)
return cmd
}
func NewCmdRemoveSCCFromGroup(name, fullName string, f kcmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
o := NewSCCModificationOptions(streams)
cmd := &cobra.Command{
Use: name + " SCC GROUP [GROUP ...]",
Short: "Remove group from scc",
Long: `Remove group from scc`,
Run: func(cmd *cobra.Command, args []string) {
kcmdutil.CheckErr(o.CompleteGroups(f, cmd, args))
kcmdutil.CheckErr(o.RemoveSCC())
},
}
kcmdutil.AddDryRunFlag(cmd)
o.PrintFlags.AddFlags(cmd)
return cmd
}
func NewCmdRemoveSCCFromUser(name, fullName string, f kcmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
o := NewSCCModificationOptions(streams)
o.SANames = []string{}
cmd := &cobra.Command{
Use: name + " SCC USER [USER ...]",
Short: "Remove user from scc",
Long: `Remove user from scc`,
Run: func(cmd *cobra.Command, args []string) {
kcmdutil.CheckErr(o.CompleteUsers(f, cmd, args))
kcmdutil.CheckErr(o.RemoveSCC())
},
}
cmd.Flags().StringSliceVarP(&o.SANames, "serviceaccount", "z", o.SANames, "service account in the current namespace to use as a user")
kcmdutil.AddDryRunFlag(cmd)
o.PrintFlags.AddFlags(cmd)
return cmd
}
func (o *SCCModificationOptions) CompleteUsers(f kcmdutil.Factory, cmd *cobra.Command, args []string) error {
if len(args) < 1 {
return errors.New("you must specify a scc")
}
o.SCCName = args[0]
o.Subjects = buildSubjects(args[1:], []string{})
if (len(o.Subjects) == 0) && (len(o.SANames) == 0) {
return errors.New("you must specify at least one user or service account")
}
o.DryRun = kcmdutil.GetFlagBool(cmd, "dry-run")
o.Output = kcmdutil.GetFlagString(cmd, "output")
o.ToPrinter = func(message string) (printers.ResourcePrinter, error) {
o.PrintFlags.NamePrintFlags.Operation = message
if o.DryRun {
o.PrintFlags.Complete("%s (dry run)")
}
return o.PrintFlags.ToPrinter()
}
clientConfig, err := f.ToRESTConfig()
if err != nil {
return err
}
securityClient, err := securityv1typedclient.NewForConfig(clientConfig)
if err != nil {
return err
}
o.SCCInterface = securityClient.SecurityContextConstraints()
o.DefaultSubjectNamespace, _, err = f.ToRawKubeConfigLoader().Namespace()
if err != nil {
return err
}
for _, sa := range o.SANames {
o.Subjects = append(o.Subjects, corev1.ObjectReference{Namespace: o.DefaultSubjectNamespace, Name: sa, Kind: "ServiceAccount"})
}
return nil
}
func (o *SCCModificationOptions) CompleteGroups(f kcmdutil.Factory, cmd *cobra.Command, args []string) error {
if len(args) < 2 {
return errors.New("you must specify at least two arguments: <scc> <group> [group]...")
}
o.Output = kcmdutil.GetFlagString(cmd, "output")
o.DryRun = kcmdutil.GetFlagBool(cmd, "dry-run")
o.ToPrinter = func(message string) (printers.ResourcePrinter, error) {
o.PrintFlags.NamePrintFlags.Operation = message
if o.DryRun {
o.PrintFlags.Complete("%s (dry run)")
}
return o.PrintFlags.ToPrinter()
}
o.IsGroup = true
o.SCCName = args[0]
o.Subjects = buildSubjects([]string{}, args[1:])
clientConfig, err := f.ToRESTConfig()
if err != nil {
return err
}
securityClient, err := securityv1typedclient.NewForConfig(clientConfig)
if err != nil {
return err
}
o.SCCInterface = securityClient.SecurityContextConstraints()
o.DefaultSubjectNamespace, _, err = f.ToRawKubeConfigLoader().Namespace()
if err != nil {
return err
}
return nil
}
func (o *SCCModificationOptions) AddSCC() error {
scc, err := o.SCCInterface.Get(o.SCCName, metav1.GetOptions{})
if err != nil {
return err
}
users, groups := stringSubjectsFor(o.DefaultSubjectNamespace, o.Subjects)
usersToAdd, _ := diff(users, scc.Users)
groupsToAdd, _ := diff(groups, scc.Groups)
scc.Users = append(scc.Users, usersToAdd...)
scc.Groups = append(scc.Groups, groupsToAdd...)
message := successMessage(true, o.IsGroup, users, groups)
p, err := o.ToPrinter(message)
if err != nil {
return err
}
if o.DryRun {
return p.PrintObj(scc, o.Out)
}
_, err = o.SCCInterface.Update(scc)
if err != nil {
return err
}
return p.PrintObj(scc, o.Out)
}
func (o *SCCModificationOptions) RemoveSCC() error {
scc, err := o.SCCInterface.Get(o.SCCName, metav1.GetOptions{})
if err != nil {
return err
}
users, groups := stringSubjectsFor(o.DefaultSubjectNamespace, o.Subjects)
_, remainingUsers := diff(users, scc.Users)
_, remainingGroups := diff(groups, scc.Groups)
scc.Users = remainingUsers
scc.Groups = remainingGroups
message := successMessage(false, o.IsGroup, users, groups)
p, err := o.ToPrinter(message)
if err != nil {
return err
}
if o.DryRun {
return p.PrintObj(scc, o.Out)
}
_, err = o.SCCInterface.Update(scc)
if err != nil {
return err
}
return p.PrintObj(scc, o.Out)
}
func diff(lhsSlice, rhsSlice []string) (lhsOnly []string, rhsOnly []string) {
return singleDiff(lhsSlice, rhsSlice), singleDiff(rhsSlice, lhsSlice)
}
func singleDiff(lhsSlice, rhsSlice []string) (lhsOnly []string) {
for _, lhs := range lhsSlice {
found := false
for _, rhs := range rhsSlice {
if lhs == rhs {
found = true
break
}
}
if !found {
lhsOnly = append(lhsOnly, lhs)
}
}
return lhsOnly
}
// generate affirmative output
func successMessage(didAdd bool, isGroup bool, usersToAdd, groupsToAdd []string) string {
verb := "removed from"
allTargets := fmt.Sprintf("%q", usersToAdd)
if isGroup {
allTargets = fmt.Sprintf("%q", groupsToAdd)
}
if didAdd {
verb = "added to"
}
if isGroup {
verb += " groups"
}
return fmt.Sprintf("%s: %s", verb, allTargets)
}