/
type.go
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/
type.go
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// Copyright (c) 2018 Ashley Jeffs
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package tls
import (
"crypto/tls"
"crypto/x509"
"io/ioutil"
)
//------------------------------------------------------------------------------
// Documentation is a markdown description of how and why to use TLS settings.
const Documentation = `### TLS
Custom TLS settings can be used to override system defaults. This includes
providing a collection of root certificate authorities, providing a list of
client certificates to use for client verification and skipping certificate
verification.
Client certificates can either be added by file or by raw contents:
` + "``` yaml" + `
enabled: true
client_certs:
- cert_file: ./example.pem
key_file: ./example.key
- cert: foo
key: bar
` + "```" + ``
//------------------------------------------------------------------------------
// ClientCertConfig contains config fields for a client certificate.
type ClientCertConfig struct {
CertFile string `json:"cert_file" yaml:"cert_file"`
KeyFile string `json:"key_file" yaml:"key_file"`
Cert string `json:"cert" yaml:"cert"`
Key string `json:"key" yaml:"key"`
}
// Config contains configuration params for TLS.
type Config struct {
Enabled bool `json:"enabled" yaml:"enabled"`
RootCAsFile string `json:"root_cas_file" yaml:"root_cas_file"`
InsecureSkipVerify bool `json:"skip_cert_verify" yaml:"skip_cert_verify"`
ClientCertificates []ClientCertConfig `json:"client_certs" yaml:"client_certs"`
}
// NewConfig creates a new Config with default values.
func NewConfig() Config {
return Config{
Enabled: false,
RootCAsFile: "",
InsecureSkipVerify: false,
ClientCertificates: []ClientCertConfig{},
}
}
//------------------------------------------------------------------------------
// Get returns a valid *tls.Config based on the configuration values of Config.
func (c *Config) Get() (*tls.Config, error) {
var rootCAs *x509.CertPool
if len(c.RootCAsFile) > 0 {
caCert, err := ioutil.ReadFile(c.RootCAsFile)
if err != nil {
return nil, err
}
rootCAs = x509.NewCertPool()
rootCAs.AppendCertsFromPEM(caCert)
}
clientCerts := []tls.Certificate{}
for _, conf := range c.ClientCertificates {
cert, err := conf.Load()
if nil != err {
return nil, err
}
clientCerts = append(clientCerts, cert)
}
return &tls.Config{
InsecureSkipVerify: c.InsecureSkipVerify,
RootCAs: rootCAs,
Certificates: clientCerts,
}, nil
}
// Load returns a TLS certificate, based on either file paths in the
// config or the raw certs as strings.
func (c *ClientCertConfig) Load() (tls.Certificate, error) {
if c.CertFile != "" && c.KeyFile != "" {
return tls.LoadX509KeyPair(c.CertFile, c.KeyFile)
}
return tls.X509KeyPair([]byte(c.Cert), []byte(c.Key))
}
//------------------------------------------------------------------------------