81 lines
2.4 KiB
Go
81 lines
2.4 KiB
Go
// Copyright (c) 2026 Probo Inc <hello@probo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package bootstrap
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"fmt"
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"math/big"
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"time"
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)
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const (
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samlCertValidityYears = 10
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samlKeyBits = 2048
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)
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// GenerateSAMLCertificate generates a self-signed certificate and private key
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// for SAML authentication. The certificate is valid for 10 years.
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func GenerateSAMLCertificate() (cert string, key string, err error) {
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privateKey, err := rsa.GenerateKey(rand.Reader, samlKeyBits)
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if err != nil {
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return "", "", fmt.Errorf("generate RSA key: %w", err)
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}
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serialNumber, err := rand.Int(rand.Reader, new(big.Int).Lsh(big.NewInt(1), 128))
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if err != nil {
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return "", "", fmt.Errorf("generate serial number: %w", 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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CommonName: "probo-saml",
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Organization: []string{"Probo"},
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Country: []string{"US"},
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},
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NotBefore: time.Now(),
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NotAfter: time.Now().AddDate(samlCertValidityYears, 0, 0),
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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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certDER, err := x509.CreateCertificate(rand.Reader, &template, &template, &privateKey.PublicKey, privateKey)
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if err != nil {
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return "", "", fmt.Errorf("create certificate: %w", err)
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}
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certPEM := pem.EncodeToMemory(
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&pem.Block{
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Type: "CERTIFICATE",
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Bytes: certDER,
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},
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)
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keyPEM := pem.EncodeToMemory(
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&pem.Block{
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Type: "RSA PRIVATE KEY",
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Bytes: x509.MarshalPKCS1PrivateKey(privateKey),
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},
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)
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return string(certPEM), string(keyPEM), nil
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}
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