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cert.go
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cert.go
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// Copyright 2023 The ClusterLink 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 bootstrap
import (
"os"
"path/filepath"
"github.com/clusterlink-net/clusterlink/cmd/clusterlink/config"
"github.com/clusterlink-net/clusterlink/pkg/controlplane/api"
dpapi "github.com/clusterlink-net/clusterlink/pkg/dataplane/api"
)
// Certificate represents a clusterlink certificate.
type Certificate struct {
cert *certificate
}
// RawCert returns the raw certificate bytes.
func (c *Certificate) RawCert() []byte {
chain := c.cert.certPEM
if c.cert.parent != nil {
chain = append(chain, c.cert.parent.certPEM...)
}
return chain
}
// RawKey returns the raw private key bytes.
func (c *Certificate) RawKey() []byte {
return c.cert.keyPEM
}
// CreateFabricCertificate creates a clusterlink fabric (root) certificate.
func CreateFabricCertificate(name string) (*Certificate, error) {
cert, err := createCertificate(&certificateConfig{
Name: name,
IsCA: true,
})
if err != nil {
return nil, err
}
return &Certificate{cert: cert}, nil
}
// CreatePeerCertificate creates a peer certificate.
func CreatePeerCertificate(name string, fabricCert *Certificate) (*Certificate, error) {
cert, err := createCertificate(&certificateConfig{
Parent: fabricCert.cert,
Name: name,
IsCA: true,
DNSNames: []string{name},
})
if err != nil {
return nil, err
}
return &Certificate{cert: cert}, nil
}
// CreatePeerCertificate creates a controlplane certificate.
func CreateControlplaneCertificate(peer string, peerCert *Certificate) (*Certificate, error) {
cert, err := createCertificate(&certificateConfig{
Parent: peerCert.cert,
Name: "cl-controlplane",
IsServer: true,
IsClient: true,
DNSNames: []string{peer, api.GRPCServerName(peer)},
})
if err != nil {
return nil, err
}
return &Certificate{cert: cert}, nil
}
// CreatePeerCertificate creates a dataplane certificate.
func CreateDataplaneCertificate(peer string, peerCert *Certificate) (*Certificate, error) {
cert, err := createCertificate(&certificateConfig{
Parent: peerCert.cert,
Name: "cl-dataplane",
IsServer: true,
IsClient: true,
DNSNames: []string{dpapi.DataplaneServerName(peer)},
})
if err != nil {
return nil, err
}
return &Certificate{cert: cert}, nil
}
// CreatePeerCertificate creates a gwctl certificate.
func CreateGWCTLCertificate(peerCert *Certificate) (*Certificate, error) {
cert, err := createCertificate(&certificateConfig{
Parent: peerCert.cert,
Name: "gwctl",
IsClient: true,
})
if err != nil {
return nil, err
}
return &Certificate{cert: cert}, nil
}
// CertificateFromRaw initializes a certificate from raw data.
func CertificateFromRaw(rawCert, rawKey []byte) (*Certificate, error) {
cert, err := certificateFromRaw(rawCert, rawKey)
if err != nil {
return nil, err
}
return &Certificate{cert: cert}, nil
}
// ReadCertificates read certificate and key from folder.
func ReadCertificates(dir string, withKey bool) (*Certificate, error) {
// Read certificate
rawCert, err := os.ReadFile(filepath.Join(dir, config.CertificateFileName))
if err != nil {
return nil, err
}
var rawFabricKey []byte
if withKey {
// Read key
rawFabricKey, err = os.ReadFile(filepath.Join(dir, config.PrivateKeyFileName))
if err != nil {
return nil, err
}
}
cert, err := CertificateFromRaw(rawCert, rawFabricKey)
if err != nil {
return nil, err
}
return cert, nil
}