github.com/stefanmcshane/helm@v0.0.0-20221213002717-88a4a2c6e77d/internal/tlsutil/cfg.go (about)

     1  /*
     2  Copyright The Helm Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package tlsutil
    18  
    19  import (
    20  	"crypto/tls"
    21  	"crypto/x509"
    22  	"os"
    23  
    24  	"github.com/pkg/errors"
    25  )
    26  
    27  // Options represents configurable options used to create client and server TLS configurations.
    28  type Options struct {
    29  	CaCertFile string
    30  	// If either the KeyFile or CertFile is empty, ClientConfig() will not load them.
    31  	KeyFile  string
    32  	CertFile string
    33  	// Client-only options
    34  	InsecureSkipVerify bool
    35  }
    36  
    37  // ClientConfig returns a TLS configuration for use by a Helm client.
    38  func ClientConfig(opts Options) (cfg *tls.Config, err error) {
    39  	var cert *tls.Certificate
    40  	var pool *x509.CertPool
    41  
    42  	if opts.CertFile != "" || opts.KeyFile != "" {
    43  		if cert, err = CertFromFilePair(opts.CertFile, opts.KeyFile); err != nil {
    44  			if os.IsNotExist(err) {
    45  				return nil, errors.Wrapf(err, "could not load x509 key pair (cert: %q, key: %q)", opts.CertFile, opts.KeyFile)
    46  			}
    47  			return nil, errors.Wrapf(err, "could not read x509 key pair (cert: %q, key: %q)", opts.CertFile, opts.KeyFile)
    48  		}
    49  	}
    50  	if !opts.InsecureSkipVerify && opts.CaCertFile != "" {
    51  		if pool, err = CertPoolFromFile(opts.CaCertFile); err != nil {
    52  			return nil, err
    53  		}
    54  	}
    55  
    56  	cfg = &tls.Config{InsecureSkipVerify: opts.InsecureSkipVerify, Certificates: []tls.Certificate{*cert}, RootCAs: pool}
    57  	return cfg, nil
    58  }