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util.go
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util.go
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// Copyright 2018 Istio Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package rbac
import (
"errors"
"fmt"
"strings"
"istio.io/istio/mixer/template/authorization"
"istio.io/istio/pkg/log"
)
// SubjectArgs contains information about the subject of a request.
type SubjectArgs struct {
User string
Groups string
Properties []string
}
// ActionArgs contains information about the detail of a request.
type ActionArgs struct {
Namespace string
Service string
Method string
Path string
Properties []string
}
// istioctlLogger is used redirect the mixer adapter log to standard log in istioctl.
type istioctlLogger struct{}
// Infof from adapter.Logger.
func (l istioctlLogger) Infof(format string, args ...interface{}) {
// Redirect info to debug for istioctl.
log.Debugf(format, args...)
}
// Warningf from adapter.Logger.
func (l istioctlLogger) Warningf(format string, args ...interface{}) {
log.Warnf(format, args...)
}
// Errorf from adapter.Logger.
func (l istioctlLogger) Errorf(format string, args ...interface{}) error {
s := fmt.Sprintf(format, args...)
log.Errorf(s)
return errors.New(s)
}
// Debugf from adapter.Logger.
func (l istioctlLogger) Debugf(format string, args ...interface{}) {
log.Debugf(format, args...)
}
// InfoEnabled from adapter.Logger.
func (l istioctlLogger) InfoEnabled() bool {
return false
}
// WarnEnabled from adapter.Logger.
func (l istioctlLogger) WarnEnabled() bool {
return false
}
// ErrorEnabled from adapter.Logger.
func (l istioctlLogger) ErrorEnabled() bool {
return false
}
// DebugEnabled from adapter.Logger.
func (l istioctlLogger) DebugEnabled() bool {
return false
}
// Check performs the permission check for given subject on the given action.
func (rs *ConfigStore) Check(subject SubjectArgs, action ActionArgs) (bool, error) {
instance, err := createInstance(subject, action)
if err != nil {
return false, err
}
return rs.CheckPermission(instance, istioctlLogger{})
}
func createInstance(subject SubjectArgs, action ActionArgs) (*authorization.Instance, error) {
instance := &authorization.Instance{
Subject: &authorization.Subject{
User: subject.User,
Groups: subject.Groups,
Properties: map[string]interface{}{},
},
Action: &authorization.Action{
Namespace: action.Namespace,
Service: action.Service,
Method: action.Method,
Path: action.Path,
Properties: map[string]interface{}{},
},
}
if err := fillInstanceProperties(&instance.Subject.Properties, subject.Properties); err != nil {
return nil, err
}
if err := fillInstanceProperties(&instance.Action.Properties, action.Properties); err != nil {
return nil, err
}
return instance, nil
}
func fillInstanceProperties(properties *map[string]interface{}, arguments []string) error {
for _, arg := range arguments {
// Use the part before the first = as key and the remaining part as a string value, this is
// the only supported format of RBAC adapter for now.
split := strings.SplitN(arg, "=", 2)
if len(split) != 2 {
return fmt.Errorf("invalid property %v, the format should be: key=value", arg)
}
value, present := (*properties)[split[0]]
if present {
return fmt.Errorf("duplicate property %v, previous value %v", arg, value)
}
(*properties)[split[0]] = split[1]
}
return nil
}