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// Copyright 2016 The Prometheus Authors
// 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 config
import (
"crypto/tls"
"crypto/x509"
"fmt"
"io/ioutil"
)
// TLSConfig configures the options for TLS connections.
type TLSConfig struct {
// The CA cert to use for the targets.
CAFile string `yaml:"ca_file,omitempty"`
// The client cert file for the targets.
CertFile string `yaml:"cert_file,omitempty"`
// The client key file for the targets.
KeyFile string `yaml:"key_file,omitempty"`
// Disable target certificate validation.
InsecureSkipVerify bool `yaml:"insecure_skip_verify"`
// Catches all undefined fields and must be empty after parsing.
XXX map[string]interface{} `yaml:",inline"`
}
// UnmarshalYAML implements the yaml.Unmarshaler interface.
func (c *TLSConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
type plain TLSConfig
if err := unmarshal((*plain)(c)); err != nil {
return err
}
return checkOverflow(c.XXX, "TLS config")
}
// GenerateConfig produces a tls.Config based on TLS connection options.
// It loads certificate files from disk if they are defined.
func (c *TLSConfig) GenerateConfig() (*tls.Config, error) {
tlsConfig := &tls.Config{InsecureSkipVerify: c.InsecureSkipVerify}
// If a CA cert is provided then let's read it in so we can validate the
// scrape target's certificate properly.
if len(c.CAFile) > 0 {
caCertPool := x509.NewCertPool()
// Load CA cert.
caCert, err := ioutil.ReadFile(c.CAFile)
if err != nil {
return nil, fmt.Errorf("unable to use specified CA cert %s: %s", c.CAFile, err)
}
caCertPool.AppendCertsFromPEM(caCert)
tlsConfig.RootCAs = caCertPool
}
if len(c.CertFile) > 0 && len(c.KeyFile) == 0 {
return nil, fmt.Errorf("client cert file %q specified without client key file", c.CertFile)
} else if len(c.KeyFile) > 0 && len(c.CertFile) == 0 {
return nil, fmt.Errorf("client key file %q specified without client cert file", c.KeyFile)
} else if len(c.CertFile) > 0 && len(c.KeyFile) > 0 {
cert, err := tls.LoadX509KeyPair(c.CertFile, c.KeyFile)
if err != nil {
return nil, fmt.Errorf("unable to use specified client cert (%s) & key (%s): %s", c.CertFile, c.KeyFile, err)
}
tlsConfig.Certificates = []tls.Certificate{cert}
}
tlsConfig.BuildNameToCertificate()
return tlsConfig, nil
}
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