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This is a Nagios plugin for checking SSHFP records. It checks that all SSHFP records correspond to a key the server offers, that all keys the server offers have SSHFP records, and that all SSHFP records are correct. Incorrect SSHFP records are considered CRITICAL; missing or superfluous ones are considered WARNING.

Requires Python 3, dnspython, and the ssh-keyscan program. (On Debian, that means python3-dnspython and openssh-client.) Currently happens to work under Python 2 also, but this has not been tested as extensively.

Here's a define command stanza for it:

define command {
  command_name check_sshfp
  command_line /path/to/check_sshfp '$HOSTADDRESS$'
}

MIT license.