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Ahh, the joy of Cloudflare SNI certificates

Posted by Daniel Lange on
Internet

Nice neighbourhood, https://www.amsterdam.nl...

For your copy and paste pleasure:

openssl s_client -connect www.amsterdam.nl:443 < /dev/null | openssl x509 -noout -text | grep DNS:

Screenshot of openssl s_client -connect www.amsterdam.nl:443

Update

03.11.18: Cloudflare fixed this mess somewhat. They now look for SNI servernames and use customer-specific certs. See:

openssl s_client -servername www.amsterdam.nl -connect www.amsterdam.nl:443 < /dev/null | openssl x509 -noout -text | grep DNS:

(notice the -servername in the above vs. the original command that will fail with something like 140246838507160:error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure:s23_clnt.c:769: now)