Linux and PHP web application support and development (Bromsgrove, UK)

ssh

SSH fingerprint (sshfp) dns records

March 14, 2014 linux, security, systems administration

To help aid security for SSH connections, you can publish ‘SSHFP’ records in DNS which contain a fingerprint of a server’s ssh host key. If DNSSEC is in use throughout the DNS hierarchy then it ought to provide a trusted way of verifying remote hosts when no record already exists in your ~/.ssh/known_hosts file. To […]

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Two Factor Authentication for remote SSH users (using google authenticator)

May 27, 2013 linux, security, systems administration

Using Google’s Authenticator, we can change a Debian Linux host to make it require two factor authentication for remote users (or selected users based on name/ip address) as follows.

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