Archive for March, 2014

Installing a Signed X.509 SSL Certificate into ASA via the CLI

March 11th, 2014 No comments

Having already generated the RSA key-pair on the ASA with “crypto key generate rsa mod 2048”) create a trustpoint for the VPN users, generated an SSL cetificate and CSR and have received the signed X.509 certificate and CA and intermediate SSL certificates, the certificate and CA certs will need to be installked onto the Cisco ASA.  This procedure describes the method using the CLI. Read more…

Categories: Network Design, SSL/TLS Tags:

OpenSSL Client Commands – Check the Contents of an SSL Certificate

March 7th, 2014 No comments

Here are a list of useful OpenSSL commands which might be useful to use in a Bash script:

Determine who issued the certificate:
$ echo | openssl s_client -connect 2>/dev/null | openssl x509 -noout -issuer
issuer= /C=US/O=Company Inc/ Read more…

Categories: SSL/TLS Tags: , ,

SSL/TLS Handshake and Record Data Protocol

March 3rd, 2014 No comments

When an TLS/SSL session (such as HTTPS (default port 443) is established an SSL handshake or exchange of messages occur between the client (initiating the connection) – and a server. (See this post for an explanation of SSL certificates and encoding).

The first set of messages are called the Handshake Protocol after which both client and server enter the Record (or Data) Protocol. The messages exchanged during the Handshake Protocol achieves the following: Read more…

Categories: Security, SSL/TLS Tags: ,