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Re: How can I secure a Debian installation?



On 1/31/2014 1:17 AM, Артур Истомин wrote:
On Tue, Jan 28, 2014 at 08:37:57PM +0000, Brian wrote:
On Tue 28 Jan 2014 at 11:40:04 -0800, Jon Danniken wrote:

Thanks Brian, I ended up removing openssh-server, as it was not
something I needed; it was automatically installed and set up to run as
a "feature" of the live CD I used to install Debian with (installed as
part of the "live-tools" package). Fortunately I came across the posting
that alerted me to this, and have removed it from both of my machines.

Removing software which runs as a daemon is good practice. Why have a
process listening for external connections when it is unnecessary?

If I end up using openssh in the future I will definitely use a private
key, though.

Another battle lost. :)

But ssh keys are great for some situations. The problem is their
advocates never describe what the situations are and it is too often a
case of being instructed to "use a ssh key". The downsides to a ssh
key are left unsaid and the impression is given that a password login is
naff and insecure. The pros and cons of an ssh key login are rarely
disussed by these advocates,

I'll just end by reminding you that your ssh key might be stored on a
USB stick. Forget the stick and you don't get to access your account.
Passwords are in your memory and, fallible though it might be, it is
usually accessible. In the last resort the password could come to you
in a dream. :)

Moreover, all intrusions in open source projects (through ssh) like
kernel's git in 2011 or Fedora's repos occurred as a consequence of
stealing private keys instead of password guessing.

Also, "SSH: passwords or keys?" - http://lwn.net/Articles/369703/



Yes, but overall, many more passwords (and other private information) have been stolen with keyloggers. And even more have been guessed with brute force attacks.

Private keys need to be protected as much as passwords.

Jerry


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