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ssh allowing root login with no password



I am trying to setup our servers to only allow logins with a public/private
key pair.  2 of our machines have to have root login access with ssh and the
rest, we will login as another account and su to root.  I just started with
this company and on their boxes which range from version 5.1 to 5.5, if I
open up the firewall to allow ssh access from anywhere, I can ssh to root
without a password.  The only uncommented lines in the /etc/ssh/sshd_config
are the following:

 

Protocol 2   

SyslogFacility AUTHPRIV

PasswordAuthentication no  

ChallengeResponseAuthentication no  

GSSAPIAuthentication yes

GSSAPICleanupCredentials yes 

UsePAM no

PubkeyAuthentication yes

AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY
LC_MESSAGES

AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT 

AcceptEnv LC_IDENTIFICATION LC_ALL

GatewayPorts yes

X11Forwarding yes

Subsystem       sftp    /usr/libexec/openssh/sftp-server

 

I'm hoping that someone can lead me in the right direction as I can't figure
this one out.  If this was only one machine, I would assume that it might
have been hacked, but this is all of their servers and VM's that will allow
me to ssh to them without a login/password and get into root.  Luckily, they
have always had their (supposedly anyway) iptables set to only allow access
from specific IP's.

 

Thanks

Steve

 



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