Logging connections and services on Linux server

We have a linux server in which i am concerned that it might be getting hacked. it is running debian 7.7.

Is there something that i can install that you will log all the connections that occur on the server with ip address user/pass etc.

I am not terribly advanced as you can probably tell from this question so please dumb down any response.

Thanks
KoolandrewAsked:
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