mirror of
https://github.com/Luzifer/promcertcheck.git
synced 2024-09-19 09:22:57 +00:00
99 lines
2.4 KiB
Go
99 lines
2.4 KiB
Go
package main
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import (
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"crypto/x509"
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"fmt"
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"net/http"
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"net/url"
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"strings"
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"time"
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log "github.com/sirupsen/logrus"
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)
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type probeResult uint
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const (
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certificateOK probeResult = iota
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certificateNotFound
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certificateExpiresSoon
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certificateInvalid
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generalFailure
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)
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func (p probeResult) String() string {
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switch p {
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case certificateOK:
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return "Certificate OK"
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case certificateExpiresSoon:
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return fmt.Sprintf("Certificate expires within %s", config.ExpireWarning)
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case certificateInvalid:
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return "Certificate invalid / intermediate certificates not present"
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case certificateNotFound:
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return "Did not find a certificate valid for this domain"
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case generalFailure:
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return "Something went wrong in the request"
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}
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return "" // This does not happen.
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}
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func checkCertificate(probeURL *url.URL) (probeResult, *x509.Certificate) {
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checkLogger := log.WithFields(log.Fields{"probe_url": probeURL})
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req, _ := http.NewRequest("HEAD", probeURL.String(), nil)
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req.Header.Set("User-Agent", fmt.Sprintf("Mozilla/5.0 (compatible; PromCertcheck/%s; +https://github.com/Luzifer/promcertcheck)", version))
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resp, err := http.DefaultClient.Do(req)
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switch {
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case err == nil:
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case strings.Contains(err.Error(), redirectFoundError.Error()):
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checkLogger.WithError(err).Warn("A redirect was found")
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default:
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checkLogger.WithError(err).Error("HTTP request failed")
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return generalFailure, nil
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}
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resp.Body.Close()
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intermediatePool := x509.NewCertPool()
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var verifyCert *x509.Certificate
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hostPort := strings.Split(probeURL.Host, ":")
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host := hostPort[0]
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for _, cert := range resp.TLS.PeerCertificates {
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wildHost := "*" + host[strings.Index(host, "."):]
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if !inSlice(cert.DNSNames, host) && !inSlice(cert.DNSNames, wildHost) {
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intermediatePool.AddCert(cert)
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continue
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}
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verifyCert = cert
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}
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if verifyCert == nil {
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checkLogger.Debug("Certificate not found")
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return certificateNotFound, nil
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}
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verificationResult := false
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if _, err := verifyCert.Verify(x509.VerifyOptions{
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Intermediates: intermediatePool,
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}); err == nil {
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verificationResult = true
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}
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if !verificationResult {
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checkLogger.Debug("Certificate invalid")
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return certificateInvalid, verifyCert
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}
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if verifyCert.NotAfter.Sub(time.Now()) < config.ExpireWarning {
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checkLogger.Debug("Certificate expires soon")
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return certificateExpiresSoon, verifyCert
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}
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checkLogger.Debug("Certificate OK")
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return certificateOK, verifyCert
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}
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