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certs.go
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/
certs.go
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// Copyright 2015 The Mangos Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use 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 O R CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package test
import (
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"net"
"sync"
"time"
)
type key struct {
key *rsa.PrivateKey
keyPEM []byte
cert *x509.Certificate
certDER []byte
certPEM []byte
pair tls.Certificate
}
type keys struct {
root key
server key
client key
}
func (k *key) genKey(bits int) (err error) {
if k.key, err = rsa.GenerateKey(rand.Reader, bits); err != nil {
return
}
k.keyPEM = pem.EncodeToMemory(&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(k.key),
})
return
}
func (k *key) genCert(tmpl *x509.Certificate, parent *key) (err error) {
k.cert = tmpl // for self-signed, we pass ourself as parent, this makes it work
k.certDER, err = x509.CreateCertificate(rand.Reader, tmpl, parent.cert, &k.key.PublicKey, parent.key)
if err != nil {
return
}
if k.cert, err = x509.ParseCertificate(k.certDER); err != nil {
return
}
k.certPEM = pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: k.certDER})
k.pair, err = tls.X509KeyPair(k.certPEM, k.keyPEM)
if err != nil {
return
}
return
}
func newKeys() (k *keys, err error) {
k = &keys{}
if err = k.root.genKey(2048); err != nil {
return nil, err
}
if err = k.server.genKey(1024); err != nil {
return nil, err
}
if err = k.client.genKey(1024); err != nil {
return nil, err
}
if err = k.root.genCert(rootTmpl, &k.root); err != nil {
return nil, err
}
if err = k.server.genCert(serverTmpl, &k.root); err != nil {
return nil, err
}
if err = k.client.genCert(clientTmpl, &k.root); err != nil {
return nil, err
}
return k, nil
}
var rootTmpl = &x509.Certificate{
SerialNumber: big.NewInt(1),
Issuer: pkix.Name{
CommonName: "issuer.mangos.example.com",
Organization: []string{"Mangos Issuer Org"},
},
Subject: pkix.Name{
CommonName: "root.mangos.example.com",
Organization: []string{"Mangos Root Org"},
},
NotBefore: time.Unix(1000, 0),
NotAfter: time.Now().Add(time.Hour),
IsCA: true,
BasicConstraintsValid: true,
OCSPServer: []string{"ocsp.mangos.example.com"},
DNSNames: []string{"root.mangos.example.com"},
IPAddresses: []net.IP{net.ParseIP("127.0.0.1")},
SignatureAlgorithm: x509.SHA1WithRSA,
KeyUsage: x509.KeyUsageCertSign,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
}
var serverTmpl = &x509.Certificate{
SerialNumber: big.NewInt(2),
Issuer: pkix.Name{
CommonName: "issuer.mangos.example.com",
Organization: []string{"Mangos Issuer Org"},
},
Subject: pkix.Name{
CommonName: "server.mangos.example.com",
Organization: []string{"Mangos Server Org"},
},
NotBefore: time.Unix(1000, 0),
NotAfter: time.Now().Add(time.Hour),
IsCA: false,
OCSPServer: []string{"ocsp.mangos.example.com"},
DNSNames: []string{"server.mangos.example.com"},
IPAddresses: []net.IP{net.ParseIP("127.0.0.1")},
SignatureAlgorithm: x509.SHA1WithRSA,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
}
var clientTmpl = &x509.Certificate{
SerialNumber: big.NewInt(3),
Issuer: pkix.Name{
CommonName: "issuer.mangos.example.com",
Organization: []string{"Mangos Issuer Org"},
},
Subject: pkix.Name{
CommonName: "client.mangos.example.com",
Organization: []string{"Mangos Client Org"},
},
NotBefore: time.Unix(1000, 0),
NotAfter: time.Now().Add(time.Hour),
IsCA: false,
OCSPServer: []string{"ocsp.mangos.example.com"},
DNSNames: []string{"client.mangos.example.com"},
IPAddresses: []net.IP{net.ParseIP("127.0.0.1")},
SignatureAlgorithm: x509.SHA1WithRSA,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
}
// NewTLSConfig creates a suitable TLS configuration, using
// either a server or client. A self-signed CA Cert is included.
func NewTLSConfig(server bool) (*tls.Config, error) {
cfg := &tls.Config{}
keys, err := newKeys()
if err != nil {
return nil, err
}
if server {
cfg.Certificates = append(cfg.Certificates, keys.server.pair)
} else {
cfg.Certificates = append(cfg.Certificates, keys.client.pair)
}
cfg.InsecureSkipVerify = true
return cfg, nil
}
var lock sync.Mutex
var clientConfig *tls.Config
var serverConfig *tls.Config
// GetTLSConfig is like NewTLSConfig, but it caches to avoid regenerating
// key material pointlessly.
func GetTLSConfig(server bool) (*tls.Config, error) {
var err error
var cfg *tls.Config
lock.Lock()
if server {
if cfg = serverConfig; cfg == nil {
cfg, err = NewTLSConfig(true)
serverConfig = cfg
}
} else {
if cfg = clientConfig; cfg == nil {
cfg, err = NewTLSConfig(false)
clientConfig = cfg
}
}
lock.Unlock()
return cfg, err
}