64 lines
1.7 KiB
Go
64 lines
1.7 KiB
Go
package crypto
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/tls"
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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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"time"
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log "github.com/sirupsen/logrus"
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)
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// GenerateSelfSignedCert Generate a self-signed TLS Certificate, to be used as fallback
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func GenerateSelfSignedCert() (tls.Certificate, error) {
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priv, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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log.WithError(err).Warning("Failed to generate private key")
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return tls.Certificate{}, err
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}
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keyUsage := x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment
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notBefore := time.Now()
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notAfter := notBefore.Add(365 * 24 * time.Hour)
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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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log.WithError(err).Warning("Failed to generate serial number")
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return tls.Certificate{}, err
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}
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template := x509.Certificate{
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SerialNumber: serialNumber,
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Subject: pkix.Name{
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Organization: []string{"authentik"},
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CommonName: "authentik default certificate",
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},
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NotBefore: notBefore,
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NotAfter: notAfter,
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KeyUsage: keyUsage,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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BasicConstraintsValid: true,
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}
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template.DNSNames = []string{"*"}
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derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
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if err != nil {
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log.Warning(err)
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}
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pemBytes := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
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privBytes, err := x509.MarshalPKCS8PrivateKey(priv)
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if err != nil {
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log.Warning(err)
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}
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privPemByes := pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: privBytes})
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return tls.X509KeyPair(pemBytes, privPemByes)
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}
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