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certfile.go
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certfile.go
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// Copyright (c) 2017 mgIT GmbH. All rights reserved.
// Distributed under the Apache License. See LICENSE for details.
package main
import (
"crypto/x509"
"encoding/pem"
"log"
"os"
"path/filepath"
"strings"
zglob "github.com/mattn/go-zglob"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
)
type CertFileOptions struct {
Globs []string `json:"globs"`
ExcludeSystem bool `json:"exclude_system"`
}
type CertFileChecker struct {
opts CertFileOptions
promCertExpires *prometheus.Desc
}
func NewCertFileChecker(opts CertFileOptions) *CertFileChecker {
return &CertFileChecker{
opts: opts,
promCertExpires: prometheus.NewDesc(
"certfile_expires",
"Time when the certificate will expire",
[]string{"file", "cn"},
nil),
}
}
func (c *CertFileChecker) Describe(ch chan<- *prometheus.Desc) {
ch <- c.promCertExpires
}
func (c *CertFileChecker) Collect(ch chan<- prometheus.Metric) {
for _, glob := range c.opts.Globs {
matches, err := zglob.GlobFollowSymlinks(glob)
if err != nil {
log.Printf("failed to glob %q: %v", glob, err)
continue
}
for _, m := range matches {
if c.opts.ExcludeSystem && strings.HasPrefix(m, "/etc/ssl/certs/") {
continue
}
if err := c.collectCert(m, ch); err != nil {
log.Printf("failed to check %q: %v", m, err)
}
}
}
}
func (c *CertFileChecker) collectCert(p string, ch chan<- prometheus.Metric) error {
if !filepath.IsAbs(p) {
absPath, err := filepath.Abs(p)
if err != nil {
return errors.Wrap(err, "failed to determine absolute path")
}
p = absPath
}
data, err := os.ReadFile(p)
if err != nil {
return errors.Wrapf(err, "failed to read file")
}
block, _ := pem.Decode(data)
if block.Type != "CERTIFICATE" {
return nil
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return errors.Wrap(err, "failed to parse certificate")
}
if cert.NotAfter.IsZero() {
return nil
}
ch <- prometheus.MustNewConstMetric(
c.promCertExpires,
prometheus.GaugeValue,
float64(cert.NotAfter.Unix()),
p,
cert.Subject.CommonName,
)
return nil
}