58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
/*
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Package ca implements a disk file-backed certificate authority with a built-in
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CRL signer. The certificate authority can issue new certificates (including the
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creation of intermediate CAs) and revoke existing certificates, resulting in a
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fresh CRL.
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*/
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package ca
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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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"fmt"
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"os"
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"path/filepath"
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"src.lwithers.me.uk/go/rsa/pkg/pemfile"
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"src.lwithers.me.uk/go/rsa/pkg/serial"
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)
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const (
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auditLogDir = "audit.log"
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)
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func (ca *CA) Sign(template *x509.Certificate, key *rsa.PublicKey) (*x509.Certificate, string, error) {
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if template.SerialNumber == nil {
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template.SerialNumber = serial.Rand()
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}
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// sign the certificate
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der, err := x509.CreateCertificate(rand.Reader, template, ca.root, key, ca.key)
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if err != nil {
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return nil, "",
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fmt.Errorf("failed to sign certificate: %w", err)
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}
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// parse the just-signed certificate
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cert, err := x509.ParseCertificate(der)
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if err != nil {
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return nil, "",
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fmt.Errorf("failed to parse certificate after signing: %w", err)
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}
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// save the newly-signed cert in the audit log
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auditDir := filepath.Join(ca.dir, auditLogDir, template.SerialNumber.Text(16))
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if err := os.MkdirAll(auditDir, 0700); err != nil {
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return nil, "",
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fmt.Errorf("failed to create audit log directory: %w", err)
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}
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if err := pemfile.Write(filepath.Join(auditDir, "cert.pem"), pemfile.TypeX509Certificate, der); err != nil {
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return nil, "",
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fmt.Errorf("failed to save certificate in audit log: %w", err)
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}
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return cert, auditDir, nil
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}
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