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// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package component
import (
"context"
"crypto/tls"
"crypto/x509"
"golang.org/x/crypto/acme"
)
// TLSConfigOption provides customization for TLS configuration.
type TLSConfigOption interface {
apply(*tls.Config)
}
// TLSConfigOptionFunc is a TLSConfigOption.
type TLSConfigOptionFunc func(*tls.Config)
func (fn TLSConfigOptionFunc) apply(c *tls.Config) {
fn(c)
}
// WithTLSClientAuth sets TLS client authentication options.
func WithTLSClientAuth(auth tls.ClientAuthType, cas *x509.CertPool, verify func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error) TLSConfigOption {
return TLSConfigOptionFunc(func(c *tls.Config) {
c.ClientAuth = auth
c.ClientCAs = cas
c.VerifyPeerCertificate = verify
})
}
// WithNextProtos appends the given protocols to NextProtos.
func WithNextProtos(protos ...string) TLSConfigOption {
return TLSConfigOptionFunc(func(c *tls.Config) {
c.NextProtos = append(c.NextProtos, protos...)
})
}
// GetTLSConfig gets the component's TLS config and applies the given options.
func (c *Component) GetTLSConfig(ctx context.Context, opts ...TLSConfigOption) (*tls.Config, error) {
var conf *tls.Config
if c.acme != nil {
conf = &tls.Config{
GetCertificate: c.acme.GetCertificate,
}
opts = append(opts, WithNextProtos(acme.ALPNProto))
} else {
var err error
conf, err = c.config.TLS.Config(ctx)
if err != nil {
return nil, err
}
}
conf.MinVersion = tls.VersionTLS12
conf.NextProtos = []string{"h2", "http/1.1"}
conf.PreferServerCipherSuites = true
for _, opt := range opts {
opt.apply(conf)
}
return conf, nil
}