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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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