Pull Request: Created ssh-os.nse script #1728

[Richard Lam <richlam.dev () gmail com>]

Hello,

As the subject title infers.  I have submitted a script, titled
ssh-os.nse.  Welcome any feedback for improvement and/or criteria for
acceptance.  Thank you.

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Script identifies Ubuntu, FreeBSD, or Debian version based on response of
default SSH banner.

Identifies the following versions:

Ubuntu 4.10 to 19.04
FreeBSD 4.3 to 12.0-RELEASE
Debian 4.0 to 10.0

Originally this work was for the service-os script from the nse script
ideas page <https://secwiki.org/w/Nmap/Script_Ideas#service-os>, however,
Ubuntu, FreeBSD, and Debian can be identified by default SSH banner,
without cross referencing a response from another service. Consequently
submitting this as a separate script.

Banner information used to implement this script located:
https://github.com/richlamdev/ssh-default-banners

----------------

regards,

Richard Lam

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