forked from argoproj/argo-cd
/
rbac.go
215 lines (194 loc) · 6.16 KB
/
rbac.go
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package rbac
import (
"context"
"fmt"
"time"
"github.com/casbin/casbin"
"github.com/casbin/casbin/model"
jwt "github.com/dgrijalva/jwt-go"
"github.com/gobuffalo/packr"
scas "github.com/qiangmzsx/string-adapter"
log "github.com/sirupsen/logrus"
apiv1 "k8s.io/api/core/v1"
apierr "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
v1 "k8s.io/client-go/informers/core/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
jwtutil "github.com/argoproj/argo-cd/util/jwt"
)
const (
ConfigMapPolicyCSVKey = "policy.csv"
ConfigMapPolicyDefaultKey = "policy.default"
builtinModelFile = "model.conf"
defaultRBACSyncPeriod = 10 * time.Minute
)
// ClaimsEnforcerFunc is func template
type ClaimsEnforcerFunc func(rvals ...interface{}) bool
type Enforcer struct {
*casbin.Enforcer
clientset kubernetes.Interface
namespace string
configmap string
claimsEnforcerFunc ClaimsEnforcerFunc
model model.Model
defaultRole string
builtinPolicy string
userDefinedPolicy string
}
func NewEnforcer(clientset kubernetes.Interface, namespace, configmap string, claimsEnforcer ClaimsEnforcerFunc) *Enforcer {
box := packr.NewBox(".")
modelConf := box.String(builtinModelFile)
model := casbin.NewModel(modelConf)
enf := casbin.Enforcer{}
enf.EnableLog(false)
return &Enforcer{
Enforcer: &enf,
clientset: clientset,
namespace: namespace,
configmap: configmap,
model: model,
claimsEnforcerFunc: claimsEnforcer,
}
}
// SetDefaultRole sets a default role to use during enforcement. Will fall back to this role if
// normal enforcement fails
func (e *Enforcer) SetDefaultRole(roleName string) {
e.defaultRole = roleName
}
// SetClaimsEnforcerFunc sets a claims enforce function during enforcement. The claims enforce function
// can extract claims from JWT token and do the proper enforcement based on user, group or any information
// available in the input parameter list
func (e *Enforcer) SetClaimsEnforcerFunc(claimsEnforcer ClaimsEnforcerFunc) {
e.claimsEnforcerFunc = claimsEnforcer
}
// Enforce is a wrapper around casbin.Enforce to additionally enforce a default role
func (e *Enforcer) Enforce(rvals ...interface{}) bool {
if e.Enforcer.Enforce(rvals...) {
return true
}
if e.defaultRole == "" {
return false
}
rvals = append([]interface{}{e.defaultRole}, rvals[1:]...)
return e.Enforcer.Enforce(rvals...)
}
// EnforceClaims checks if the first value is a jwt.Claims and runs enforce against its groups and sub
func (e *Enforcer) EnforceClaims(rvals ...interface{}) bool {
// Use default claims enforcer if it is nil
if e.claimsEnforcerFunc == nil {
return e.defaultEnforceClaims(rvals...)
}
return e.claimsEnforcerFunc(rvals...)
}
func (e *Enforcer) defaultEnforceClaims(rvals ...interface{}) bool {
claims, ok := rvals[0].(jwt.Claims)
if !ok {
if rvals[0] == nil {
vals := append([]interface{}{""}, rvals[1:]...)
return e.Enforce(vals...)
}
return e.Enforce(rvals...)
}
mapClaims, err := jwtutil.MapClaims(claims)
if err != nil {
vals := append([]interface{}{""}, rvals[1:]...)
return e.Enforce(vals...)
}
groups := jwtutil.GetGroups(mapClaims)
for _, group := range groups {
vals := append([]interface{}{group}, rvals[1:]...)
if e.Enforcer.Enforce(vals...) {
return true
}
}
user := jwtutil.GetField(mapClaims, "sub")
vals := append([]interface{}{user}, rvals[1:]...)
return e.Enforce(vals...)
}
// SetBuiltinPolicy sets a built-in policy, which augments any user defined policies
func (e *Enforcer) SetBuiltinPolicy(policy string) error {
sa := scas.NewAdapter(fmt.Sprintf("%s\n%s", policy, e.userDefinedPolicy))
enf, err := casbin.NewEnforcerSafe(e.model, sa)
if err != nil {
return fmt.Errorf("failed to update enforcer: %v", err)
}
e.builtinPolicy = policy
e.Enforcer = enf
return nil
}
// SetUserPolicy sets a user policy, augmenting the built-in policy
func (e *Enforcer) SetUserPolicy(policy string) error {
sa := scas.NewAdapter(fmt.Sprintf("%s\n%s", e.builtinPolicy, policy))
enf, err := casbin.NewEnforcerSafe(e.model, sa)
if err != nil {
return fmt.Errorf("failed to update enforcer: %v", err)
}
e.userDefinedPolicy = policy
e.Enforcer = enf
return nil
}
// newInformers returns an informer which watches updates on the rbac configmap
func (e *Enforcer) newInformer() cache.SharedIndexInformer {
tweakConfigMap := func(options *metav1.ListOptions) {
cmFieldSelector := fields.ParseSelectorOrDie(fmt.Sprintf("metadata.name=%s", e.configmap))
options.FieldSelector = cmFieldSelector.String()
}
return v1.NewFilteredConfigMapInformer(e.clientset, e.namespace, defaultRBACSyncPeriod, cache.Indexers{}, tweakConfigMap)
}
// RunPolicyLoader runs the policy loader which watches policy updates from the configmap and reloads them
func (e *Enforcer) RunPolicyLoader(ctx context.Context) error {
cm, err := e.clientset.CoreV1().ConfigMaps(e.namespace).Get(e.configmap, metav1.GetOptions{})
if err != nil {
if !apierr.IsNotFound(err) {
return err
}
} else {
err = e.syncUpdate(cm)
if err != nil {
return err
}
}
e.runInformer(ctx)
return nil
}
func (e *Enforcer) runInformer(ctx context.Context) {
cmInformer := e.newInformer()
cmInformer.AddEventHandler(
cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
if cm, ok := obj.(*apiv1.ConfigMap); ok {
err := e.syncUpdate(cm)
if err != nil {
log.Error(err)
}
}
},
UpdateFunc: func(old, new interface{}) {
oldCM := old.(*apiv1.ConfigMap)
newCM := new.(*apiv1.ConfigMap)
if oldCM.ResourceVersion == newCM.ResourceVersion {
return
}
log.Infof("%s updated", e.configmap)
err := e.syncUpdate(newCM)
if err != nil {
log.Error(err)
}
},
},
)
log.Info("Starting rbac config informer")
cmInformer.Run(ctx.Done())
log.Info("rbac configmap informer cancelled")
}
// syncUpdate updates the enforcer
func (e *Enforcer) syncUpdate(cm *apiv1.ConfigMap) error {
e.SetDefaultRole(cm.Data[ConfigMapPolicyDefaultKey])
policyCSV, ok := cm.Data[ConfigMapPolicyCSVKey]
if !ok {
policyCSV = ""
}
return e.SetUserPolicy(policyCSV)
}