Andreas Oster <aos...@novanetwork.de> (Fr 07 Jul 2017 08:15:05 CEST): > Hi all, > > I am currently struggling with an odd sieve/Pigeonhole issue. Some weeks ago > I had to replace our dovecot certificate due to expiration. In the past I > did use a self-signed certificate, but because we now have a little openssl > based CA I have decided to create signed certificate for imaps. Dovecot is > happily accepting the new certificate which has integrated the whole > cert-chain. Unfortunately Pigeonhole does not seem to like the certificate:
As it seem, Pigeonhole sends you the full cert chain:
> *** Starting TLS handshake
> - Certificate type: X.509
> - Got a certificate list of 3 certificates.
> - Certificate[0] info:
> - subject `C=DE,ST=Baden-Wuerttemberg,L=Ettlingen,O=NOVA Elektroanlagen
…
> - Certificate[2] info:
> - subject `C=DE,ST=Baden-Wuerttemberg,L=Ettlingen,O=NOVA Elektroanlagen
> GmbH,OU=NOVA Root CA,CN=NOVA Root CA', issuer
The last one being the CA used.
> SHA-1 fingerprint `95326e3ff12683cc40a85874d562d0a6f15dcb37'
> - Status: The certificate is NOT trusted. The certificate issuer is unknown.
> *** PKI verification of server certificate failed...
> *** Fatal error: Error in the certificate.
> *** Handshake has failed
For me it reads as if your client (gnutls-cli) does not trust
the chain your server sent. (The server doesn't care about the chain).
> I have checked the certificate with:
>
> openssl verify -verbose -CAfile /etc/ssl/certs/ca-chain.cert.pem
> /etc/ssl/certs/mail.novanetwork.local.cert.pem
> /etc/ssl/certs/mail.novanetwork.local.cert.pem: OK
How do you know that gnutls-cli uses the same CA file? Try passing the
CA file to gnutls-cli?
The --x509cafile seems to be hardcoded in
/usr/lib/x86_64-linux-gnu/libgnutls.so.30 (Debian9, amd64)
$ strings /usr/lib/x86_64-linux-gnu/libgnutls.so.30 | grep '/etc/ssl'
/etc/ssl/certs/ca-certificates.crt
So, on my system gnutls-cli seems to use the same CA store
(/etc/ssl/certs) as openssl.
Best regards from Dresden/Germany
Viele Grüße aus Dresden
Heiko Schlittermann
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