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// SPDX-License-Identifier: GPL-3.0-or-later
package tlscfg
import (
"crypto/tls"
"crypto/x509"
"fmt"
"os"
)
// TLSConfig represents the standard client TLS configuration.
type TLSConfig struct {
// TLSCA specifies the certificate authority to use when verifying server certificates.
TLSCA string `yaml:"tls_ca" json:"tls_ca"`
// TLSCert specifies tls certificate file.
TLSCert string `yaml:"tls_cert" json:"tls_cert"`
// TLSKey specifies tls key file.
TLSKey string `yaml:"tls_key" json:"tls_key"`
// InsecureSkipVerify controls whether a client verifies the server's certificate chain and host name.
InsecureSkipVerify bool `yaml:"tls_skip_verify" json:"tls_skip_verify"`
}
// NewTLSConfig creates a tls.Config, may be nil without an error if TLS is not configured.
func NewTLSConfig(cfg TLSConfig) (*tls.Config, error) {
if cfg.TLSCA == "" && cfg.TLSKey == "" && cfg.TLSCert == "" && !cfg.InsecureSkipVerify {
return nil, nil
}
tlsConfig := &tls.Config{
InsecureSkipVerify: cfg.InsecureSkipVerify,
Renegotiation: tls.RenegotiateNever,
}
if cfg.TLSCA != "" {
pool, err := loadCertPool([]string{cfg.TLSCA})
if err != nil {
return nil, err
}
tlsConfig.RootCAs = pool
}
if cfg.TLSCert != "" && cfg.TLSKey != "" {
cert, err := loadCertificate(cfg.TLSCert, cfg.TLSKey)
if err != nil {
return nil, err
}
tlsConfig.Certificates = []tls.Certificate{cert}
}
return tlsConfig, nil
}
func loadCertPool(certFiles []string) (*x509.CertPool, error) {
pool := x509.NewCertPool()
for _, certFile := range certFiles {
pem, err := os.ReadFile(certFile)
if err != nil {
return nil, fmt.Errorf("could not read certificate %q: %v", certFile, err)
}
if !pool.AppendCertsFromPEM(pem) {
return nil, fmt.Errorf("could not parse any PEM certificates %q: %v", certFile, err)
}
}
return pool, nil
}
func loadCertificate(certFile, keyFile string) (tls.Certificate, error) {
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
return tls.Certificate{}, fmt.Errorf("could not load keypair %s:%s: %v", certFile, keyFile, err)
}
return cert, nil
}
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