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ensure.go
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ensure.go
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package origin
import (
"fmt"
"io/ioutil"
"regexp"
"time"
"github.com/golang/glog"
kapi "k8s.io/kubernetes/pkg/api"
kapierror "k8s.io/kubernetes/pkg/api/errors"
"k8s.io/kubernetes/pkg/api/unversioned"
kclient "k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/util"
"k8s.io/kubernetes/pkg/util/wait"
"github.com/openshift/origin/pkg/cmd/admin/policy"
authorizationapi "github.com/openshift/origin/pkg/authorization/api"
clusterpolicyregistry "github.com/openshift/origin/pkg/authorization/registry/clusterpolicy"
clusterpolicystorage "github.com/openshift/origin/pkg/authorization/registry/clusterpolicy/etcd"
"github.com/openshift/origin/pkg/cmd/server/admin"
"github.com/openshift/origin/pkg/cmd/server/bootstrappolicy"
)
// ensureOpenShiftSharedResourcesNamespace is called as part of global policy initialization to ensure shared namespace exists
func (c *MasterConfig) ensureOpenShiftSharedResourcesNamespace() {
if _, err := c.KubeClient().Namespaces().Get(c.Options.PolicyConfig.OpenShiftSharedResourcesNamespace); kapierror.IsNotFound(err) {
namespace, createErr := c.KubeClient().Namespaces().Create(&kapi.Namespace{ObjectMeta: kapi.ObjectMeta{Name: c.Options.PolicyConfig.OpenShiftSharedResourcesNamespace}})
if createErr != nil {
glog.Errorf("Error creating namespace: %v due to %v\n", c.Options.PolicyConfig.OpenShiftSharedResourcesNamespace, createErr)
return
}
c.ensureNamespaceServiceAccountRoleBindings(namespace)
}
}
// ensureOpenShiftInfraNamespace is called as part of global policy initialization to ensure infra namespace exists
func (c *MasterConfig) ensureOpenShiftInfraNamespace() {
ns := c.Options.PolicyConfig.OpenShiftInfrastructureNamespace
// Ensure namespace exists
namespace, err := c.KubeClient().Namespaces().Create(&kapi.Namespace{ObjectMeta: kapi.ObjectMeta{Name: ns}})
if kapierror.IsAlreadyExists(err) {
// Get the persisted namespace
namespace, err = c.KubeClient().Namespaces().Get(ns)
if err != nil {
glog.Errorf("Error getting namespace %s: %v", ns, err)
return
}
} else if err != nil {
glog.Errorf("Error creating namespace %s: %v", ns, err)
return
}
roleAccessor := policy.NewClusterRoleBindingAccessor(c.ServiceAccountRoleBindingClient())
for _, saName := range bootstrappolicy.InfraSAs.GetServiceAccounts() {
_, err := c.KubeClient().ServiceAccounts(ns).Create(&kapi.ServiceAccount{ObjectMeta: kapi.ObjectMeta{Name: saName}})
if err != nil && !kapierror.IsAlreadyExists(err) {
glog.Errorf("Error creating service account %s/%s: %v", ns, saName, err)
}
role, _ := bootstrappolicy.InfraSAs.RoleFor(saName)
reconcileRole := &policy.ReconcileClusterRolesOptions{
RolesToReconcile: []string{role.Name},
Confirmed: true,
Union: true,
Out: ioutil.Discard,
RoleClient: c.PrivilegedLoopbackOpenShiftClient.ClusterRoles(),
}
if err := reconcileRole.RunReconcileClusterRoles(nil, nil); err != nil {
glog.Errorf("Could not reconcile %v: %v\n", role.Name, err)
}
addRole := &policy.RoleModificationOptions{
RoleName: role.Name,
RoleBindingAccessor: roleAccessor,
Subjects: []kapi.ObjectReference{{Namespace: ns, Name: saName, Kind: "ServiceAccount"}},
}
if err := kclient.RetryOnConflict(kclient.DefaultRetry, func() error { return addRole.AddRole() }); err != nil {
glog.Errorf("Could not add %v service accounts to the %v cluster role: %v\n", saName, role.Name, err)
} else {
glog.V(2).Infof("Added %v service accounts to the %v cluster role: %v\n", saName, role.Name, err)
}
}
c.ensureNamespaceServiceAccountRoleBindings(namespace)
}
// ensureDefaultNamespaceServiceAccountRoles initializes roles for service accounts in the default namespace
func (c *MasterConfig) ensureDefaultNamespaceServiceAccountRoles() {
// Wait for the default namespace
var namespace *kapi.Namespace
for i := 0; i < 30; i++ {
ns, err := c.KubeClient().Namespaces().Get(kapi.NamespaceDefault)
if err == nil {
namespace = ns
break
}
if kapierror.IsNotFound(err) {
time.Sleep(time.Second)
continue
}
glog.Errorf("Error adding service account roles to %q namespace: %v", kapi.NamespaceDefault, err)
return
}
if namespace == nil {
glog.Errorf("Namespace %q not found, could not initialize the %q namespace", kapi.NamespaceDefault, kapi.NamespaceDefault)
return
}
c.ensureNamespaceServiceAccountRoleBindings(namespace)
}
// ensureNamespaceServiceAccountRoleBindings initializes roles for service accounts in the namespace
func (c *MasterConfig) ensureNamespaceServiceAccountRoleBindings(namespace *kapi.Namespace) {
const ServiceAccountRolesInitializedAnnotation = "openshift.io/sa.initialized-roles"
// Short-circuit if we're already initialized
if namespace.Annotations[ServiceAccountRolesInitializedAnnotation] == "true" {
return
}
hasErrors := false
for _, binding := range bootstrappolicy.GetBootstrapServiceAccountProjectRoleBindings(namespace.Name) {
addRole := &policy.RoleModificationOptions{
RoleName: binding.RoleRef.Name,
RoleNamespace: binding.RoleRef.Namespace,
RoleBindingAccessor: policy.NewLocalRoleBindingAccessor(namespace.Name, c.ServiceAccountRoleBindingClient()),
Subjects: binding.Subjects,
}
if err := kclient.RetryOnConflict(kclient.DefaultRetry, func() error { return addRole.AddRole() }); err != nil {
glog.Errorf("Could not add service accounts to the %v role in the %q namespace: %v\n", binding.RoleRef.Name, namespace.Name, err)
hasErrors = true
}
}
// If we had errors, don't register initialization so we can try again
if hasErrors {
return
}
if namespace.Annotations == nil {
namespace.Annotations = map[string]string{}
}
namespace.Annotations[ServiceAccountRolesInitializedAnnotation] = "true"
// Log any error other than a conflict (the update will be retried and recorded again on next startup in that case)
if _, err := c.KubeClient().Namespaces().Update(namespace); err != nil && !kapierror.IsConflict(err) {
glog.Errorf("Error recording adding service account roles to %q namespace: %v", namespace.Name, err)
}
}
func (c *MasterConfig) securityContextConstraintsSupported() (bool, error) {
// TODO to make this a library upstream, ResourceExists(GroupVersionResource) or some such.
// look for supported groups
serverGroupList, err := c.KubeClient().ServerGroups()
if err != nil {
return false, err
}
// find the preferred version of the legacy group
var legacyGroup *unversioned.APIGroup
for i := range serverGroupList.Groups {
if len(serverGroupList.Groups[i].Name) == 0 {
legacyGroup = &serverGroupList.Groups[i]
}
}
if legacyGroup == nil {
return false, fmt.Errorf("unable to discovery preferred version for legacy api group")
}
// check if securitycontextconstraints is a resource in the group
apiResourceList, err := c.KubeClient().ServerResourcesForGroupVersion(legacyGroup.PreferredVersion.GroupVersion)
if err != nil {
return false, err
}
for _, apiResource := range apiResourceList.APIResources {
if apiResource.Name == "securitycontextconstraints" && !apiResource.Namespaced {
return true, nil
}
}
return false, nil
}
func (c *MasterConfig) ensureDefaultSecurityContextConstraints() {
sccSupported, err := c.securityContextConstraintsSupported()
if err != nil {
glog.Errorf("Unable to determine if security context constraints are supported. Got error: %v", err)
return
}
if !sccSupported {
glog.Infof("Ignoring default security context constraints when running on external Kubernetes.")
return
}
ns := c.Options.PolicyConfig.OpenShiftInfrastructureNamespace
bootstrapSCCGroups, bootstrapSCCUsers := bootstrappolicy.GetBoostrapSCCAccess(ns)
for _, scc := range bootstrappolicy.GetBootstrapSecurityContextConstraints(bootstrapSCCGroups, bootstrapSCCUsers) {
_, err := c.KubeClient().SecurityContextConstraints().Create(&scc)
if kapierror.IsAlreadyExists(err) {
continue
}
if err != nil {
glog.Errorf("Unable to create default security context constraint %s. Got error: %v", scc.Name, err)
continue
}
glog.Infof("Created default security context constraint %s", scc.Name)
}
}
// ensureComponentAuthorizationRules initializes the cluster policies
func (c *MasterConfig) ensureComponentAuthorizationRules() {
clusterPolicyStorage, err := clusterpolicystorage.NewStorage(c.RESTOptionsGetter)
if err != nil {
glog.Errorf("Error creating policy storage: %v", err)
return
}
clusterPolicyRegistry := clusterpolicyregistry.NewRegistry(clusterPolicyStorage)
ctx := kapi.WithNamespace(kapi.NewContext(), "")
if _, err := clusterPolicyRegistry.GetClusterPolicy(ctx, authorizationapi.PolicyName); kapierror.IsNotFound(err) {
glog.Infof("No cluster policy found. Creating bootstrap policy based on: %v", c.Options.PolicyConfig.BootstrapPolicyFile)
if err := admin.OverwriteBootstrapPolicy(c.RESTOptionsGetter, c.Options.PolicyConfig.BootstrapPolicyFile, admin.CreateBootstrapPolicyFileFullCommand, true, ioutil.Discard); err != nil {
glog.Errorf("Error creating bootstrap policy: %v", err)
}
} else {
glog.V(2).Infof("Ignoring bootstrap policy file because cluster policy found")
}
// Wait until the policy cache has caught up before continuing
review := &authorizationapi.SubjectAccessReview{Action: authorizationapi.Action{Verb: "get", Group: authorizationapi.GroupName, Resource: "clusterpolicies"}}
err = wait.PollImmediate(100*time.Millisecond, 30*time.Second, func() (done bool, err error) {
result, err := c.PolicyClient().SubjectAccessReviews().Create(review)
if err == nil && result.Allowed {
return true, nil
}
if kapierror.IsForbidden(err) || (err == nil && !result.Allowed) {
glog.V(2).Infof("waiting for policy cache to initialize")
return false, nil
}
return false, err
})
if err != nil {
glog.Errorf("error waiting for policy cache to initialize: %v", err)
}
// Reconcile roles that must exist for the cluster to function
// Be very judicious about what is placed in this list, since it will be enforced on every server start
reconcileRoles := &policy.ReconcileClusterRolesOptions{
RolesToReconcile: []string{bootstrappolicy.DiscoveryRoleName},
Confirmed: true,
Union: true,
Out: ioutil.Discard,
RoleClient: c.PrivilegedLoopbackOpenShiftClient.ClusterRoles(),
}
if err := reconcileRoles.RunReconcileClusterRoles(nil, nil); err != nil {
glog.Errorf("Could not auto reconcile roles: %v\n", err)
}
// Reconcile rolebindings that must exist for the cluster to function
// Be very judicious about what is placed in this list, since it will be enforced on every server start
reconcileRoleBindings := &policy.ReconcileClusterRoleBindingsOptions{
RolesToReconcile: []string{bootstrappolicy.DiscoveryRoleName},
Confirmed: true,
Union: true,
Out: ioutil.Discard,
RoleBindingClient: c.PrivilegedLoopbackOpenShiftClient.ClusterRoleBindings(),
}
if err := reconcileRoleBindings.RunReconcileClusterRoleBindings(nil, nil); err != nil {
glog.Errorf("Could not auto reconcile role bindings: %v\n", err)
}
}
// ensureCORSAllowedOrigins takes a string list of origins and attempts to covert them to CORS origin
// regexes, or exits if it cannot.
func (c *MasterConfig) ensureCORSAllowedOrigins() []*regexp.Regexp {
if len(c.Options.CORSAllowedOrigins) == 0 {
return []*regexp.Regexp{}
}
allowedOriginRegexps, err := util.CompileRegexps(c.Options.CORSAllowedOrigins)
if err != nil {
glog.Fatalf("Invalid --cors-allowed-origins: %v", err)
}
return allowedOriginRegexps
}