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// Copyright (c) 2022 Proton Technologies AG
//
// This file is part of ProtonMail Bridge.
//
// ProtonMail Bridge is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// ProtonMail Bridge is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>.
// Package bridge implements the bridge CLI application.
package bridge
import (
"crypto/tls"
"crypto/x509"
"time"
"github.com/pkg/errors"
)
// GetConfig tries to load TLS config or generate new one which is then returned.
func loadTlsConfig(certPath, keyPath string) (*tls.Config, error) {
c, err := tls.LoadX509KeyPair(certPath, keyPath)
if err != nil {
return nil, errors.Wrap(err, "Failed to load cert and key")
}
c.Leaf, err = x509.ParseCertificate(c.Certificate[0])
if err != nil {
return nil, errors.Wrap(err, "Failed to parse the certificate")
}
if time.Now().Add(31 * 24 * time.Hour).After(c.Leaf.NotAfter) {
return nil, errors.Wrap(err, "The X509 certificate is about to expire")
}
caCertPool := x509.NewCertPool()
caCertPool.AddCert(c.Leaf)
return &tls.Config{
Certificates: []tls.Certificate{c},
ServerName: c.Leaf.Subject.CommonName,
ClientAuth: tls.VerifyClientCertIfGiven,
RootCAs: caCertPool,
ClientCAs: caCertPool,
}, nil
}