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Safely get certificate's leaf (#150)

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- It's not guaranteed that `tls.X509KeyPair` will set `c.Leaf`.
- This patch fixes this by using a wrapper that parses the leaf
certificate(in bytes) if `c.Leaf` wasn't set.
- Resolves #149

Co-authored-by: Gusted <postmaster@gusted.xyz>
Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/150
Reviewed-by: 6543 <6543@obermui.de>
Co-authored-by: Gusted <gusted@noreply.codeberg.org>
Co-committed-by: Gusted <gusted@noreply.codeberg.org>
This commit is contained in:
Gusted 2023-01-04 04:51:27 +00:00 committed by 6543
parent 9d769aeee7
commit 98d198d419
1 changed files with 14 additions and 1 deletions
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15
server/certificates/certificates.go
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@ -303,7 +303,11 @@ func obtainCert(acmeClient *lego.Client, domains []string, renew *certificate.Re
log.Error().Err(err).Msgf("Couldn't obtain again a certificate or %v", domains)
if renew != nil && renew.CertURL != "" {
tlsCertificate, err := tls.X509KeyPair(renew.Certificate, renew.PrivateKey)
if err == nil && tlsCertificate.Leaf.NotAfter.After(time.Now()) {
if err != nil {
return mockCert(domains[0], err.Error(), mainDomainSuffix, keyDatabase), err
}
leaf, err := leaf(&tlsCertificate)
if err == nil && leaf.NotAfter.After(time.Now()) {
// avoid sending a mock cert instead of a still valid cert, instead abuse CSR field to store time to try again at
renew.CSR = []byte(strconv.FormatInt(time.Now().Add(6*time.Hour).Unix(), 10))
if err := keyDatabase.Put(name, renew); err != nil {
@ -529,3 +533,12 @@ func MaintainCertDB(ctx context.Context, interval time.Duration, mainDomainSuffi
}
}
}
// leaf returns the parsed leaf certificate, either from c.leaf or by parsing
// the corresponding c.Certificate[0].
func leaf(c *tls.Certificate) (*x509.Certificate, error) {
if c.Leaf != nil {
return c.Leaf, nil
}
return x509.ParseCertificate(c.Certificate[0])
}