user.go

package auth

import (
	"fmt"
	"io"

	kerrors "k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	utilerrors "k8s.io/apimachinery/pkg/util/errors"
	kapi "k8s.io/kubernetes/pkg/apis/core"

	authclient "github.com/openshift/origin/pkg/authorization/generated/internalclientset"
	oauthclient "github.com/openshift/origin/pkg/oauth/generated/internalclientset"
	securitytypedclient "github.com/openshift/origin/pkg/security/generated/internalclientset/typed/security/internalversion"
	userclient "github.com/openshift/origin/pkg/user/generated/internalclientset"
)

func reapForUser(
	userClient userclient.Interface,
	authorizationClient authclient.Interface,
	oauthClient oauthclient.Interface,
	securityClient securitytypedclient.SecurityContextConstraintsInterface,
	name string,
	out io.Writer) error {

	errors := []error{}

	removedSubject := kapi.ObjectReference{Kind: "User", Name: name}
	errors = append(errors, reapClusterBindings(removedSubject, authorizationClient, out)...)
	errors = append(errors, reapNamespacedBindings(removedSubject, authorizationClient, out)...)

	// Remove the user from sccs
	sccs, err := securityClient.List(metav1.ListOptions{})
	if err != nil {
		return err
	}
	for _, scc := range sccs.Items {
		retainedUsers := []string{}
		for _, user := range scc.Users {
			if user != name {
				retainedUsers = append(retainedUsers, user)
			}
		}
		if len(retainedUsers) != len(scc.Users) {
			updatedSCC := scc
			updatedSCC.Users = retainedUsers
			if _, err := securityClient.Update(&updatedSCC); err != nil && !kerrors.IsNotFound(err) {
				errors = append(errors, err)
			} else {
				fmt.Fprintf(out, "securitycontextconstraints.security.openshift.io/"+updatedSCC.Name+" updated\n")
			}
		}
	}

	// Remove the user from groups
	groups, err := userClient.User().Groups().List(metav1.ListOptions{})
	if err != nil {
		return err
	}
	for _, group := range groups.Items {
		retainedUsers := []string{}
		for _, user := range group.Users {
			if user != name {
				retainedUsers = append(retainedUsers, user)
			}
		}
		if len(retainedUsers) != len(group.Users) {
			updatedGroup := group
			updatedGroup.Users = retainedUsers
			if _, err := userClient.User().Groups().Update(&updatedGroup); err != nil && !kerrors.IsNotFound(err) {
				errors = append(errors, err)
			} else {
				fmt.Fprintf(out, "group.user.openshift.io/"+updatedGroup.Name+" updated\n")
			}
		}
	}

	// Remove the user's OAuthClientAuthorizations
	// Once https://github.com/kubernetes/kubernetes/pull/28112 is fixed, use a field selector
	// to filter on the userName, rather than fetching all authorizations and filtering client-side
	authorizations, err := oauthClient.Oauth().OAuthClientAuthorizations().List(metav1.ListOptions{})
	if err != nil {
		return err
	}
	for _, authorization := range authorizations.Items {
		if authorization.UserName == name {
			if err := oauthClient.Oauth().OAuthClientAuthorizations().Delete(authorization.Name, &metav1.DeleteOptions{}); err != nil && !kerrors.IsNotFound(err) {
				errors = append(errors, err)
			} else {
				fmt.Fprintf(out, "oauthclientauthorization.oauth.openshift.io/"+authorization.Name+" updated\n")
			}
		}
	}

	// Intentionally leave identities that reference the user
	// The user does not "own" the identities
	// If the admin wants to remove the identities, that is a distinct operation

	return utilerrors.NewAggregate(errors)
}