News Group Posts

sshd restricted users

From: mschalit@pacbell.net (Matt Schalit)
Subject: Re: SSHD restricted users.
References: <3BC30511.4BF2659C@noos.fr> 
Date: Tue, 09 Oct 2001 18:31:51 GMT

On Tue, 09 Oct 2001 13:09:21 +0000, Andre Georgel <andre.georgel@noos.fr> wrote:

>Hi, all,
>
>Can somebody say me how to allow only some defined users aailable to
>login on a server.
>
>Thank in advance for your help.
>-----------------------------------------------------
>Andre Georgel

Hi Andre,

  If you are using openssh-2.9.9p2 or similar,
you can go into your sshd config file,
 
   /usr/local/etc/sshd_config

and add a line called 

  AllowUsers jeff pete bill toad@hops

to allow only jeff and pete and bill to log in.
Also, toad could only log in from the computer hops.
Or you could restrict access by groups rather than
users using the line:

  AllowGroups sales admin

Then only members of the sales and admin groups
could log in.

No uids or gids, only names allowed.  As Tony 
mentioned, you can find these and other useful 
options in sshd(8).

Good Luck,
Matt
 

I also suggest reading Security Paranoia - restricting ssh access and SSH passphrases and keys.

Hackers will constantly try to log in to any open ssh they find. They use dictionary attacks mostly (trying random names and common passwords - "joe" with "joe1", "joe2", "password" and so on. Give them enough time and they might just get in. That's why you need to do more than just the basics.

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