forked from istio/istio
/
spiffe.go
90 lines (76 loc) · 2.34 KB
/
spiffe.go
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// Copyright 2019 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 spiffe
import (
"fmt"
"strings"
"sync"
"istio.io/istio/pkg/log"
)
const (
Scheme = "spiffe"
URIPrefix = Scheme + "://"
// The default SPIFFE URL value for trust domain
defaultTrustDomain = "cluster.local"
)
var (
trustDomain = defaultTrustDomain
trustDomainMutex sync.RWMutex
)
func SetTrustDomain(value string) {
// Replace special characters in spiffe
v := strings.Replace(value, "@", ".", -1)
trustDomainMutex.Lock()
trustDomain = v
trustDomainMutex.Unlock()
}
func GetTrustDomain() string {
trustDomainMutex.RLock()
defer trustDomainMutex.RUnlock()
return trustDomain
}
func DetermineTrustDomain(commandLineTrustDomain string, isKubernetes bool) string {
if len(commandLineTrustDomain) != 0 {
return commandLineTrustDomain
}
if isKubernetes {
return defaultTrustDomain
}
return ""
}
// GenSpiffeURI returns the formatted uri(SPIFFEE format for now) for the certificate.
func GenSpiffeURI(ns, serviceAccount string) (string, error) {
var err error
if ns == "" || serviceAccount == "" {
err = fmt.Errorf(
"namespace or service account empty for SPIFFEE uri ns=%v serviceAccount=%v", ns, serviceAccount)
}
return URIPrefix + GetTrustDomain() + "/ns/" + ns + "/sa/" + serviceAccount, err
}
// MustGenSpiffeURI returns the formatted uri(SPIFFEE format for now) for the certificate and logs if there was an error.
func MustGenSpiffeURI(ns, serviceAccount string) string {
uri, err := GenSpiffeURI(ns, serviceAccount)
if err != nil {
log.Debug(err.Error())
}
return uri
}
// GenCustomSpiffe returns the spiffe string that can have a custom structure
func GenCustomSpiffe(identity string) string {
if identity == "" {
log.Error("spiffe identity can't be empty")
return ""
}
return URIPrefix + GetTrustDomain() + "/" + identity
}