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modify_scc.go
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/
modify_scc.go
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package policy
import (
"errors"
"io"
"github.com/spf13/cobra"
kapi "k8s.io/kubernetes/pkg/api"
kclient "k8s.io/kubernetes/pkg/client/unversioned"
kcmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/util"
authorizationapi "github.com/openshift/origin/pkg/authorization/api"
"github.com/openshift/origin/pkg/cmd/util/clientcmd"
uservalidation "github.com/openshift/origin/pkg/user/api/validation"
)
const (
AddSCCToGroupRecommendedName = "add-scc-to-group"
AddSCCToUserRecommendedName = "add-scc-to-user"
RemoveSCCFromGroupRecommendedName = "remove-scc-from-group"
RemoveSCCFromUserRecommendedName = "remove-scc-from-user"
)
type SCCModificationOptions struct {
SCCName string
SCCInterface kclient.SecurityContextConstraintsInterface
DefaultSubjectNamespace string
Subjects []kapi.ObjectReference
}
func NewCmdAddSCCToGroup(name, fullName string, f *clientcmd.Factory, out io.Writer) *cobra.Command {
options := &SCCModificationOptions{}
cmd := &cobra.Command{
Use: name + " SCC GROUP [GROUP ...]",
Short: "Add groups to a security context constraint",
Long: `Add groups to a security context constraint`,
Run: func(cmd *cobra.Command, args []string) {
if err := options.CompleteGroups(f, args); err != nil {
kcmdutil.CheckErr(kcmdutil.UsageError(cmd, err.Error()))
}
if err := options.AddSCC(); err != nil {
kcmdutil.CheckErr(err)
}
},
}
return cmd
}
func NewCmdAddSCCToUser(name, fullName string, f *clientcmd.Factory, out io.Writer) *cobra.Command {
options := &SCCModificationOptions{}
saNames := util.StringList{}
cmd := &cobra.Command{
Use: name + " SCC USER [USER ...]",
Short: "Add users to a security context constraint",
Long: `Add users to a security context constraint`,
Run: func(cmd *cobra.Command, args []string) {
if err := options.CompleteUsers(f, args, saNames); err != nil {
kcmdutil.CheckErr(kcmdutil.UsageError(cmd, err.Error()))
}
if err := options.AddSCC(); err != nil {
kcmdutil.CheckErr(err)
}
},
}
cmd.Flags().VarP(&saNames, "serviceaccount", "z", "service account in the current namespace to use as a user")
return cmd
}
func NewCmdRemoveSCCFromGroup(name, fullName string, f *clientcmd.Factory, out io.Writer) *cobra.Command {
options := &SCCModificationOptions{}
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) {
if err := options.CompleteGroups(f, args); err != nil {
kcmdutil.CheckErr(kcmdutil.UsageError(cmd, err.Error()))
}
if err := options.RemoveSCC(); err != nil {
kcmdutil.CheckErr(err)
}
},
}
return cmd
}
func NewCmdRemoveSCCFromUser(name, fullName string, f *clientcmd.Factory, out io.Writer) *cobra.Command {
options := &SCCModificationOptions{}
saNames := util.StringList{}
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) {
if err := options.CompleteUsers(f, args, saNames); err != nil {
kcmdutil.CheckErr(kcmdutil.UsageError(cmd, err.Error()))
}
if err := options.RemoveSCC(); err != nil {
kcmdutil.CheckErr(err)
}
},
}
cmd.Flags().VarP(&saNames, "serviceaccount", "z", "service account in the current namespace to use as a user")
return cmd
}
func (o *SCCModificationOptions) CompleteUsers(f *clientcmd.Factory, args []string, saNames util.StringList) error {
if (len(args) < 2) && (len(saNames) == 0) {
return errors.New("you must specify at least two arguments (<scc> <user> [user]...) or a service account (<scc> -z <service account name>) ")
}
o.SCCName = args[0]
o.Subjects = authorizationapi.BuildSubjects(args[1:], []string{}, uservalidation.ValidateUserName, uservalidation.ValidateGroupName)
var err error
_, o.SCCInterface, err = f.Clients()
if err != nil {
return err
}
o.DefaultSubjectNamespace, _, err = f.DefaultNamespace()
if err != nil {
return err
}
for _, sa := range saNames {
o.Subjects = append(o.Subjects, kapi.ObjectReference{Namespace: o.DefaultSubjectNamespace, Name: sa, Kind: "ServiceAccount"})
}
return nil
}
func (o *SCCModificationOptions) CompleteGroups(f *clientcmd.Factory, args []string) error {
if len(args) < 2 {
return errors.New("you must specify at least two arguments: <scc> <group> [group]...")
}
o.SCCName = args[0]
o.Subjects = authorizationapi.BuildSubjects([]string{}, args[1:], uservalidation.ValidateUserName, uservalidation.ValidateGroupName)
var err error
_, o.SCCInterface, err = f.Clients()
if err != nil {
return err
}
o.DefaultSubjectNamespace, _, err = f.DefaultNamespace()
if err != nil {
return err
}
return nil
}
func (o *SCCModificationOptions) AddSCC() error {
scc, err := o.SCCInterface.SecurityContextConstraints().Get(o.SCCName)
if err != nil {
return err
}
users, groups := authorizationapi.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...)
_, err = o.SCCInterface.SecurityContextConstraints().Update(scc)
if err != nil {
return err
}
return nil
}
func (o *SCCModificationOptions) RemoveSCC() error {
scc, err := o.SCCInterface.SecurityContextConstraints().Get(o.SCCName)
if err != nil {
return err
}
users, groups := authorizationapi.StringSubjectsFor(o.DefaultSubjectNamespace, o.Subjects)
_, remainingUsers := diff(users, scc.Users)
_, remainingGroups := diff(groups, scc.Groups)
scc.Users = remainingUsers
scc.Groups = remainingGroups
_, err = o.SCCInterface.SecurityContextConstraints().Update(scc)
if err != nil {
return err
}
return nil
}
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
}