mirror of https://github.com/portainer/portainer
83 lines
1.9 KiB
Go
83 lines
1.9 KiB
Go
package libcrypto
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/x509"
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"encoding/pem"
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"errors"
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"math/big"
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"net"
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"os"
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"time"
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)
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// GenerateCertsForHost generates a self-signed certificate for host and saves them at certPath and keyPath
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func GenerateCertsForHost(hostname, ip, certPath, keyPath string, expiry time.Time) error {
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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if err != nil {
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return err
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}
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template := x509.Certificate{
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SerialNumber: serialNumber,
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NotAfter: expiry,
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NotBefore: time.Now(),
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KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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BasicConstraintsValid: true,
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}
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parsedIP := net.ParseIP(ip)
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if parsedIP == nil {
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return errors.New("Failed parsing host ip")
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}
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template.DNSNames = append(template.DNSNames, hostname)
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template.IPAddresses = append(template.IPAddresses, parsedIP)
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keyPair, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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if err != nil {
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return err
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}
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encodedCert, err := x509.CreateCertificate(rand.Reader, &template, &template, &keyPair.PublicKey, keyPair)
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if err != nil {
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return err
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}
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err = createPEMEncodedFile(certPath, "CERTIFICATE", encodedCert)
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if err != nil {
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return err
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}
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key, err := x509.MarshalECPrivateKey(keyPair)
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if err != nil {
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return err
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}
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err = createPEMEncodedFile(keyPath, "EC PRIVATE KEY", key)
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if err != nil {
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return err
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}
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return nil
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}
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func createPEMEncodedFile(path, header string, data []byte) error {
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file, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return err
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}
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defer file.Close()
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err = pem.Encode(file, &pem.Block{Type: header, Bytes: data})
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if err != nil {
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return err
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}
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return nil
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}
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