Lets Encrypt Apache vhosts SSL does not include chain and therefore openssl fails validation

Submitted by mike0810 on Mon, 06/13/2016 - 07:01

openssl s_client -servername virtdomain.com -connect virtdomain.com:443 validation fails:

CONNECTED(00000003)
depth=0 /CN=virtdomain.com
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 /CN=virtdomain.com
verify error:num=27:certificate not trusted
verify return:1
depth=0 /CN=virtdomain.com
verify error:num=21:unable to verify the first certificate
verify return:1
---
Certificate chain
0 s:/CN=virtdomain.com
i:/C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
....
Verify return code: 21 (unable to verify the first certificate)

Problem and Solution:
Virtualmin does not include the SSL CA Chain of lets encrypt in the certificate file.

In apache > 2.4.8 there should be a file containing the intermediate AND root Certificate of LetsEncrypt https://letsencrypt.org/certificates/ in the httpd.conf Directive of every vhost: SSLCertificateChainFile /home/virtdomain.com/chain.crt additional to the SSLCertificateFile Directive.

In apache <=2.4.8 the SSLCertificateFile Directive should contain the Certificate chain in that order: {virtdomain CRT}{LE Intermediate CRT}{LE Root CRT} because the SSLCertificateChainFile is deprecated.

Status: 
Closed (fixed)

Comments

Submitted by JamieCameron on Mon, 06/13/2016 - 23:09

Virtualmin currently uses the SSLCACertificateFile directive to point to the Let's Encrypt CA cert file. Does that not work on your system?

Submitted by mike0810 on Tue, 06/14/2016 - 02:09

No, it does not work (With Openssl, with browsers, it does work). The autogenerated ssl.ca contains only the Intermediate CA and not both, the Root and the Intermediate (See https://letsencrypt.org/certificates/) so it is not the complete chain. Also when I point directly to this file /home/virtdomain.com/ssl.ca (in the apache vhost ssl config option "Certificate authorities file" which is on "default", the openssl validation does not work.

The Root Certificate (ISRG Root X1) is missing in the Chain therefore the validation is not working.

This is a vanilla installation on a Centos 7 System with Apache 2.4.6 installed by the virtualmin script.

Submitted by JamieCameron on Tue, 06/14/2016 - 21:35

Yeah, I was able to re-produce this on my test systems with the wget / openssl commands. I'll look into what's going on here.

Submitted by mike0810 on Wed, 06/15/2016 - 08:23

Hi,

please recognize my write error above:
Apache >2.4.8 should include directive SSLCertificateChainFile which should point to a crt txt file which should look like this (first intermediate, second root - here I use the Let’s Encrypt Authority X3 but it should match the intermediate which signed the virtdomain cert) :

-----BEGIN CERTIFICATE-----
MIIEkjCCA3qgAwIBAgIQCgFBQgAAAVOFc2oLheynCDANBgkqhkiG9w0BAQsFADA/
MSQwIgYDVQQKExtEaWdpdGFsIFNpZ25hdHVyZSBUcnVzdCBDby4xFzAVBgNVBAMT
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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIFazCCA1OgAwIBAgIRAIIQz7DSQONZRGPgu2OCiwAwDQYJKoZIhvcNAQELBQAw
TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh
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-----END CERTIFICATE-----

The SSLCertificateFile Directive should contain only the virtualdomain signed certificate (now in ssl.cert).

In Apache <=2.4.8 only the SSLCertificateFile Directive is used. Here the cert file should look like this (virtdomain cert - then intermediate cert - then root cert):
-----BEGIN CERTIFICATE-----
...Certificate of the virtualdomain, in current virtualmin installations this is now in ssl.cert
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIEkjCCA3qgAwIBAgIQCgFBQgAAAVOFc2oLheynCDANBgkqhkiG9w0BAQsFADA/
MSQwIgYDVQQKExtEaWdpdGFsIFNpZ25hdHVyZSBUcnVzdCBDby4xFzAVBgNVBAMT
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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIFazCCA1OgAwIBAgIRAIIQz7DSQONZRGPgu2OCiwAwDQYJKoZIhvcNAQELBQAw
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emyPxgcYxn/eR44/KJ4EBs+lVDR3veyJm+kXQ99b21/+jh5Xos1AnX5iItreGCc=
-----END CERTIFICATE-----

Submitted by JamieCameron on Sun, 07/03/2016 - 04:50

The next Webmin release will include both the X1 and X3 certs in the chained cert file.

Submitted by JamieCameron on Sun, 07/03/2016 - 04:51

Status: Active » Fixed