mirror of https://github.com/kubernetes/kops.git
110 lines
3.1 KiB
Go
110 lines
3.1 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package pki
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import (
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crypto_rand "crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"fmt"
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"math/big"
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"time"
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"github.com/golang/glog"
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)
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// BuildPKISerial produces a serial number for certs that is vanishingly unlikely to collide
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// The timestamp should be provided as an input (time.Now().UnixNano()), and then we combine
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// that with a 32 bit random crypto-rand integer.
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// We also know that a bigger value was created later (modulo clock skew)
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func BuildPKISerial(timestamp int64) *big.Int {
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randomLimit := new(big.Int).Lsh(big.NewInt(1), 32)
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randomComponent, err := crypto_rand.Int(crypto_rand.Reader, randomLimit)
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if err != nil {
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glog.Fatalf("error generating random number: %v", err)
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}
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serial := big.NewInt(timestamp)
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serial.Lsh(serial, 32)
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serial.Or(serial, randomComponent)
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return serial
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}
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func SignNewCertificate(privateKey *PrivateKey, template *x509.Certificate, signer *x509.Certificate, signerPrivateKey *PrivateKey) (*Certificate, error) {
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if template.PublicKey == nil {
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rsaPrivateKey, ok := privateKey.Key.(*rsa.PrivateKey)
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if ok {
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template.PublicKey = rsaPrivateKey.Public()
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}
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}
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if template.PublicKey == nil {
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return nil, fmt.Errorf("PublicKey not set, and cannot be determined from %T", privateKey)
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}
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now := time.Now()
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if template.NotBefore.IsZero() {
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template.NotBefore = now.Add(time.Hour * -48)
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}
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if template.NotAfter.IsZero() {
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template.NotAfter = now.Add(time.Hour * 10 * 365 * 24)
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}
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if template.SerialNumber == nil {
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := crypto_rand.Int(crypto_rand.Reader, serialNumberLimit)
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if err != nil {
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return nil, fmt.Errorf("error generating certificate serial number: %s", err)
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}
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template.SerialNumber = serialNumber
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}
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var parent *x509.Certificate
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if signer != nil {
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parent = signer
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} else {
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parent = template
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signerPrivateKey = privateKey
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}
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if template.KeyUsage == 0 {
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template.KeyUsage = x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment
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}
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if template.ExtKeyUsage == nil && !template.IsCA {
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template.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}
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}
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//c.SignatureAlgorithm = do we want to overrride?
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certificateData, err := x509.CreateCertificate(crypto_rand.Reader, template, parent, template.PublicKey, signerPrivateKey.Key)
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if err != nil {
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return nil, fmt.Errorf("error creating certificate: %v", err)
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}
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c := &Certificate{}
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c.PublicKey = template.PublicKey
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cert, err := x509.ParseCertificate(certificateData)
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if err != nil {
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return nil, fmt.Errorf("error parsing certificate: %v", err)
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}
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c.Certificate = cert
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return c, nil
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}
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