forked from Venafi/vcert
/
certificateCollection.go
167 lines (154 loc) · 4.73 KB
/
certificateCollection.go
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/*
* Copyright 2018 Venafi, Inc.
*
* 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 certificate
import (
"crypto/x509"
"encoding/pem"
"fmt"
"strings"
)
//ChainOption represents the options to be used with the certificate chain
type ChainOption int
const (
//ChainOptionRootLast specifies the root certificate should be in the last position of the chain
ChainOptionRootLast ChainOption = iota
//ChainOptionRootFirst specifies the root certificate should be in the first position of the chain
ChainOptionRootFirst
//ChainOptionIgnore specifies the chain should be ignored
ChainOptionIgnore
)
//ChainOptionFromString converts the string to the corresponding ChainOption
func ChainOptionFromString(order string) ChainOption {
switch strings.ToLower(order) {
case "root-first":
return ChainOptionRootFirst
case "ignore":
return ChainOptionIgnore
default:
return ChainOptionRootLast
}
}
//PEMCollection represents a collection of PEM data
type PEMCollection struct {
Certificate string `json:",omitempty"`
PrivateKey string `json:",omitempty"`
Chain []string `json:",omitempty"`
}
//NewPEMCollection creates a PEMCollection based on the data being passed in
func NewPEMCollection(certificate *x509.Certificate, privateKey interface{}, privateKeyPassword []byte) (*PEMCollection, error) { //todo: change to crypto.Signer type
collection := PEMCollection{}
if certificate != nil {
collection.Certificate = string(pem.EncodeToMemory(GetCertificatePEMBlock(certificate.Raw)))
}
if privateKey != nil {
var p *pem.Block
var err error
if len(privateKeyPassword) > 0 {
p, err = GetEncryptedPrivateKeyPEMBock(privateKey, privateKeyPassword)
} else {
p, err = GetPrivateKeyPEMBock(privateKey)
}
if err != nil {
return nil, err
}
collection.PrivateKey = string(pem.EncodeToMemory(p))
}
return &collection, nil
}
//PEMCollectionFromBytes creates a PEMCollection based on the data passed in
func PEMCollectionFromBytes(certBytes []byte, chainOrder ChainOption) (*PEMCollection, error) {
var (
current []byte
remaining []byte
p *pem.Block
cert *x509.Certificate
chain []*x509.Certificate
privPEM string
err error
collection *PEMCollection
)
current = certBytes
for {
p, remaining = pem.Decode(current)
if p == nil {
break
}
switch p.Type {
case "CERTIFICATE":
cert, err = x509.ParseCertificate(p.Bytes)
if err != nil {
return nil, err
}
chain = append(chain, cert)
case "RSA PRIVATE KEY", "EC PRIVATE KEY":
privPEM = string(current)
}
current = remaining
}
if len(chain) > 0 {
switch chainOrder {
case ChainOptionRootFirst:
collection, err = NewPEMCollection(chain[len(chain)-1], nil, nil)
if len(chain) > 1 && chainOrder != ChainOptionIgnore {
for _, caCert := range chain[:len(chain)-1] {
collection.AddChainElement(caCert)
}
}
default:
collection, err = NewPEMCollection(chain[0], nil, nil)
if len(chain) > 1 && chainOrder != ChainOptionIgnore {
for _, caCert := range chain[1:] {
collection.AddChainElement(caCert)
}
}
}
if err != nil {
return nil, err
}
} else {
collection = &PEMCollection{}
}
collection.PrivateKey = privPEM
return collection, nil
}
//AddPrivateKey adds a Private Key to the PEMCollection. Note that the collection can only contain one private key
func (col *PEMCollection) AddPrivateKey(privateKey interface{}, privateKeyPassword []byte) error { //todo: change to crypto.Signer type
if col.PrivateKey != "" {
return fmt.Errorf("The PEM Collection can only contain one private key")
}
var p *pem.Block
var err error
if privateKeyPassword != nil && len(privateKeyPassword) > 0 {
p, err = GetEncryptedPrivateKeyPEMBock(privateKey, privateKeyPassword)
} else {
p, err = GetPrivateKeyPEMBock(privateKey)
}
if err != nil {
return err
}
col.PrivateKey = string(pem.EncodeToMemory(p))
return nil
}
//AddChainElement adds a chain element to the collection
func (col *PEMCollection) AddChainElement(certificate *x509.Certificate) error {
if certificate == nil {
return fmt.Errorf("Certificate cannot be nil")
}
pemChain := col.Chain
pemChain = append(pemChain, string(pem.EncodeToMemory(GetCertificatePEMBlock(certificate.Raw))))
col.Chain = pemChain
return nil
}