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Archival of Calomel.org's ssh_gatekeeper script with modification to work with the google-authenticator.
ssh_gatekeeper.sh ================= The original work on this script was done by Calomel.org and is hosted at https://calomel.org/openssh.html under the Creative Commons Attribution-ShareAlike 3.0 License. The script is being hosted here so that it's in a more developer friendly medium, but also so that the following modifications could be made: - Run the google-authenticator's demo binary instead of asking a question. If the binary exits successfully, then let the user in. - Whether to allow rsync and scp, which doesn't work with 2 factor auth, is now configurable.