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90 lines
3.0 KiB
90 lines
3.0 KiB
/*
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Copyright The Helm Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package tlsutil
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import (
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"crypto/tls"
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"crypto/x509"
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"fmt"
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"os"
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)
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// Options represents configurable options used to create client and server TLS configurations.
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type Options struct {
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CaCertFile string
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// If either the KeyFile or CertFile is empty, ClientConfig() will not load them,
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// preventing Helm from authenticating to Tiller. They are required to be non-empty
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// when calling ServerConfig, otherwise an error is returned.
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KeyFile string
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CertFile string
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// Client-only options
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InsecureSkipVerify bool
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// Overrides the server name used to verify the hostname on the returned
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// certificates from the server.
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ServerName string
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// Server-only options
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ClientAuth tls.ClientAuthType
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}
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// ClientConfig returns a TLS configuration for use by a Helm client.
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func ClientConfig(opts Options) (cfg *tls.Config, err error) {
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var cert *tls.Certificate
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var pool *x509.CertPool
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if opts.CertFile != "" || opts.KeyFile != "" {
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if cert, err = CertFromFilePair(opts.CertFile, opts.KeyFile); err != nil {
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if os.IsNotExist(err) {
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return nil, fmt.Errorf("could not load x509 key pair (cert: %q, key: %q): %v", opts.CertFile, opts.KeyFile, err)
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}
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return nil, fmt.Errorf("could not read x509 key pair (cert: %q, key: %q): %v", opts.CertFile, opts.KeyFile, err)
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}
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}
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if !opts.InsecureSkipVerify && opts.CaCertFile != "" {
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if pool, err = CertPoolFromFile(opts.CaCertFile); err != nil {
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return nil, err
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}
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}
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cfg = &tls.Config{
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InsecureSkipVerify: opts.InsecureSkipVerify,
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Certificates: []tls.Certificate{*cert},
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ServerName: opts.ServerName,
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RootCAs: pool,
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}
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return cfg, nil
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}
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// ServerConfig returns a TLS configuration for use by the Tiller server.
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func ServerConfig(opts Options) (cfg *tls.Config, err error) {
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var cert *tls.Certificate
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var pool *x509.CertPool
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if cert, err = CertFromFilePair(opts.CertFile, opts.KeyFile); err != nil {
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if os.IsNotExist(err) {
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return nil, fmt.Errorf("could not load x509 key pair (cert: %q, key: %q): %v", opts.CertFile, opts.KeyFile, err)
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}
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return nil, fmt.Errorf("could not read x509 key pair (cert: %q, key: %q): %v", opts.CertFile, opts.KeyFile, err)
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}
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if opts.ClientAuth >= tls.VerifyClientCertIfGiven && opts.CaCertFile != "" {
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if pool, err = CertPoolFromFile(opts.CaCertFile); err != nil {
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return nil, err
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}
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}
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cfg = &tls.Config{MinVersion: tls.VersionTLS12, ClientAuth: opts.ClientAuth, Certificates: []tls.Certificate{*cert}, ClientCAs: pool}
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return cfg, nil
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}
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