Posted By: Anonymous
I am trying to get the certificate of a remote server, which I can then use to add to my keystore and use within my java application.
A senior dev (who is on holidays 🙁 ) informed me I can run this:
openssl s_client -connect host.host:9999
To get a raw certificate dumped out, which I can then copy and export. I receive the following output:
depth=1 /C=NZ/ST=Test State or Province/O=Organization Name/OU=Organizational Unit Name/CN=Test CA verify error:num=19:self signed certificate in certificate chain verify return:0 23177:error:14094410:SSL routines:SSL3_READ_BYTES:sslv3 alert handshake failure:s3_pkt.c:1086:SSL alert number 40 23177:error:140790E5:SSL routines:SSL23_WRITE:ssl handshake failure:s23_lib.c:188:
I have also tried with this option
and this one (running on debian mind you)
But get the same error.
This source says I can use that CApath flag but it doesn’t seem to help. I tried multiple paths to no avail.
Please let me know where I’m going wrong.
It turns out there is more complexity here: I needed to provide many more details to get this rolling. I think its something to do with the fact that its a connection that needs client authentication, and the hankshake needed more info to continue to the stage where the certificates were dumped.
Here is my working command:
openssl s_client -connect host:port -key our_private_key.pem -showcerts -cert our_server-signed_cert.pem
Hopefully this is a nudge in the right direction for anyone who could do with some more info.