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Re: SSL Certificate experation date and encryption level
From: David Fifield <david () bamsoftware com>
Date: Mon, 22 Jun 2009 19:30:44 -0600

On Mon, Jun 22, 2009 at 11:10:14AM -0400, Tony Cap wrote:
I have a request to check SSL Certificate dates and Encrytion levels.

Can I use nmap to do this?

This has been proposed as an NSE script but it doesn't exist yet.

I thought you could do this with the openssl s_client subcommand, like
        openssl s_client -connect host:port
but that doesn't print out the expiration date in plain text. You would
have to copy the base64-encoded certificate and paste it into a command
like
        openssl x509 -text -noout

For anyone interested in writing a certificate retrieval script, I think
it would involve extending the nse_openssl.cc library to enable getting
a certificate from a connected socket, and then providing functions to
extract parts of it. There are some examples of doing this in
ncat/ncat_ssl.c. SSL_get_peer_certificate is the function to get the
certificate.

David Fifield

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