64 lines
1.5 KiB
Go
64 lines
1.5 KiB
Go
package certificate
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import (
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"bytes"
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"fmt"
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"log"
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"strconv"
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"time"
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"crypto/rand"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"math/big"
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)
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func CreateCA(privateKey string) (string, error) {
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serial, _ := strconv.ParseInt(time.Now().Format("20060102150405"), 10, 64)
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ca := &x509.Certificate{
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SerialNumber: big.NewInt(serial),
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Subject: pkix.Name{
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Organization: []string{"Kubernetes Mutating Webserver CA"},
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Country: []string{"K8S"},
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Province: []string{"Cluster Service"},
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Locality: []string{"Cluster Local"},
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//StreetAddress: []string{""},
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//PostalCode: []string{""},
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},
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NotBefore: time.Now(),
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NotAfter: time.Now().AddDate(10, 0, 0),
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IsCA: true,
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ExtKeyUsage: []x509.ExtKeyUsage{
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x509.ExtKeyUsageClientAuth,
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x509.ExtKeyUsageServerAuth,
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},
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KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
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BasicConstraintsValid: true,
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SignatureAlgorithm: x509.SHA384WithRSA,
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}
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pemKey, _ := pem.Decode([]byte(privateKey))
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if pemKey == nil || pemKey.Type != "RSA PRIVATE KEY" {
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return "", fmt.Errorf("failed to decode PEM block containing private key")
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}
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keyPair, err := x509.ParsePKCS1PrivateKey(pemKey.Bytes)
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if err != nil {
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return "", err
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}
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certBytes, err := x509.CreateCertificate(rand.Reader, ca, ca, &keyPair.PublicKey, keyPair)
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if err != nil {
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return "", err
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}
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c := new(bytes.Buffer)
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pem.Encode(c, &pem.Block{
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Type: "CERTIFICATE",
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Bytes: certBytes,
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})
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log.Printf("[DEBUG] Generated Certificate Authority Certificate:\n%s", c)
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return c.String(), nil
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}
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