80 lines
2.8 KiB
Go
80 lines
2.8 KiB
Go
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// Copyright 2016 The Prometheus 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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package config
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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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"io/ioutil"
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)
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// TLSConfig configures the options for TLS connections.
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type TLSConfig struct {
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// The CA cert to use for the targets.
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CAFile string `yaml:"ca_file,omitempty"`
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// The client cert file for the targets.
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CertFile string `yaml:"cert_file,omitempty"`
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// The client key file for the targets.
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KeyFile string `yaml:"key_file,omitempty"`
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// Disable target certificate validation.
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InsecureSkipVerify bool `yaml:"insecure_skip_verify"`
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// Catches all undefined fields and must be empty after parsing.
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XXX map[string]interface{} `yaml:",inline"`
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}
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// UnmarshalYAML implements the yaml.Unmarshaler interface.
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func (c *TLSConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
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type plain TLSConfig
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if err := unmarshal((*plain)(c)); err != nil {
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return err
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}
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return checkOverflow(c.XXX, "TLS config")
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}
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// GenerateConfig produces a tls.Config based on TLS connection options.
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// It loads certificate files from disk if they are defined.
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func (c *TLSConfig) GenerateConfig() (*tls.Config, error) {
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tlsConfig := &tls.Config{InsecureSkipVerify: c.InsecureSkipVerify}
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// If a CA cert is provided then let's read it in so we can validate the
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// scrape target's certificate properly.
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if len(c.CAFile) > 0 {
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caCertPool := x509.NewCertPool()
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// Load CA cert.
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caCert, err := ioutil.ReadFile(c.CAFile)
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if err != nil {
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return nil, fmt.Errorf("unable to use specified CA cert %s: %s", c.CAFile, err)
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}
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caCertPool.AppendCertsFromPEM(caCert)
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tlsConfig.RootCAs = caCertPool
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}
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if len(c.CertFile) > 0 && len(c.KeyFile) == 0 {
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return nil, fmt.Errorf("client cert file %q specified without client key file", c.CertFile)
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} else if len(c.KeyFile) > 0 && len(c.CertFile) == 0 {
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return nil, fmt.Errorf("client key file %q specified without client cert file", c.KeyFile)
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} else if len(c.CertFile) > 0 && len(c.KeyFile) > 0 {
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cert, err := tls.LoadX509KeyPair(c.CertFile, c.KeyFile)
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if err != nil {
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return nil, fmt.Errorf("unable to use specified client cert (%s) & key (%s): %s", c.CertFile, c.KeyFile, err)
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}
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tlsConfig.Certificates = []tls.Certificate{cert}
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}
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tlsConfig.BuildNameToCertificate()
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return tlsConfig, nil
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}
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