| // Licensed to the Apache Software Foundation (ASF) under one or more |
| // contributor license agreements. See the NOTICE file distributed with |
| // this work for additional information regarding copyright ownership. |
| // The ASF licenses this file to You 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 certclient |
| |
| import ( |
| "crypto/tls" |
| "crypto/x509" |
| "errors" |
| "os" |
| ) |
| |
| // NewClientTLSConfigFromRootCertFiles creates a new tls.Config from a root certificate files. |
| func NewClientTLSConfigFromRootCertFiles(rootCertFilePaths ...string) (*tls.Config, error) { |
| rootCertDatas := make([][]byte, len(rootCertFilePaths)) |
| for i, rootCertFilePath := range rootCertFilePaths { |
| rootCertData, err := os.ReadFile(rootCertFilePath) |
| if err != nil { |
| return nil, err |
| } |
| rootCertDatas[i] = rootCertData |
| } |
| return newClientTLSConfigFromRootCertDatas(rootCertDatas...) |
| } |
| |
| // newClientTLSConfigFromRootCertDatas creates a new tls.Config from root certificate datas. |
| func newClientTLSConfigFromRootCertDatas(rootCertDatas ...[]byte) (*tls.Config, error) { |
| certPool := x509.NewCertPool() |
| for _, rootCertData := range rootCertDatas { |
| if !certPool.AppendCertsFromPEM(rootCertData) { |
| return nil, errors.New("failed to append root certificate") |
| } |
| } |
| return newClientTLSConfigFromRootCertPool(certPool), nil |
| } |
| |
| // newClientTLSConfigFromRootCertPool creates a new tls.Config from a root certificate pool. |
| func newClientTLSConfigFromRootCertPool(certPool *x509.CertPool) *tls.Config { |
| return &tls.Config{ |
| MinVersion: tls.VersionTLS12, |
| RootCAs: certPool, |
| } |
| } |
| |
| // newClientSystemTLSConfig creates a new tls.Config that uses the system cert pool for verifying |
| // server certificates. |
| func newClientSystemTLSConfig() *tls.Config { |
| return &tls.Config{ |
| MinVersion: tls.VersionTLS12, |
| // An empty TLS config will use the system certificate pool |
| // when verifying the servers certificate. This is because |
| // not setting any RootCAs will set `x509.VerifyOptions.Roots` |
| // to nil, which triggers the loading of system certs (including |
| // on Windows somehow) within (*x509.Certificate).Verify. |
| RootCAs: nil, |
| } |
| } |