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Sure,<br>
I think a hardening script might be in order (and optional).<br>
<br>
<div class="moz-cite-prefix">On 10/05/2015 06:55 PM, Steven Donegan
wrote:<br>
</div>
<blockquote
cite="mid:1932068682.965209.1444085729364.JavaMail.yahoo@mail.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff;
font-family:HelveticaNeue-Light, Helvetica Neue Light, Helvetica
Neue, Helvetica, Arial, Lucida Grande,
sans-serif;font-size:16px">BTW - I have a script to make a *NIX
box a CA and generate certificates - that could easily be added
to the DIAL/Pi/etc releases - let me see if I can scrounge it up
:-) Assuming anyone would want that ability and Steve is OK with
it :-)<br>
<div id="yui_3_16_0_1_1443990021550_80415"><span></span></div>
<div id="yui_3_16_0_1_1443990021550_80416"> </div>
<div id="yui_3_16_0_1_1443990021550_80482" class="signature">Steven
Donegan<br>
KK6IVC General Class FCC License<br>
Silver State Car #86<br>
<a class="moz-txt-link-abbreviated" href="http://www.sscc.us">www.sscc.us</a></div>
<br>
<div id="yui_3_16_0_1_1443990021550_80485" style="font-family:
HelveticaNeue-Light, Helvetica Neue Light, Helvetica Neue,
Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;">
<div id="yui_3_16_0_1_1443990021550_80484" style="font-family:
HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida
Grande, sans-serif; font-size: 16px;">
<div id="yui_3_16_0_1_1443990021550_80483" dir="ltr">
<hr id="yui_3_16_0_1_1443990021550_80529" size="1"> <font
id="yui_3_16_0_1_1443990021550_80486" face="Arial"
size="2"> <b><span style="font-weight:bold;">From:</span></b>
David Andrzejewski <a class="moz-txt-link-rfc2396E" href="mailto:david@davidandrzejewski.com"><david@davidandrzejewski.com></a><br>
<b><span style="font-weight: bold;">To:</span></b>
Steven Donegan <a class="moz-txt-link-rfc2396E" href="mailto:donegan@donegan.org"><donegan@donegan.org></a> <br>
<b><span style="font-weight: bold;">Cc:</span></b> Bryan
D. Boyle <a class="moz-txt-link-rfc2396E" href="mailto:bdboyle@bdboyle.com"><bdboyle@bdboyle.com></a>;
<a class="moz-txt-link-rfc2396E" href="mailto:app_rpt-users@ohnosec.org">"app_rpt-users@ohnosec.org"</a>
<a class="moz-txt-link-rfc2396E" href="mailto:app_rpt-users@ohnosec.org"><app_rpt-users@ohnosec.org></a> <br>
<b><span style="font-weight: bold;">Sent:</span></b>
Monday, October 5, 2015 3:50 PM<br>
<b id="yui_3_16_0_1_1443990021550_80488"><span
id="yui_3_16_0_1_1443990021550_80487"
style="font-weight: bold;">Subject:</span></b> Re:
[App_rpt-users] New Official Allstar Distribution
Released (DIAL)<br>
</font> </div>
<div id="yui_3_16_0_1_1443990021550_80489"
class="y_msg_container"><br>
<div id="yiv0251227674">
<div id="yui_3_16_0_1_1443990021550_80490">Yep -
disallowing keyboard-interactive and accepting only
certificates. I turn off PermitRootLogin and only
allow certificates. Barring some kind of exploit in
sshd, that ought to be secure enough.<br clear="none">
<br clear="none">
<span>Steven Donegan wrote:</span><br clear="none">
<blockquote type="cite">
<div class="qtdSeparateBR"><br>
<br>
</div>
<div class="yiv0251227674yqt4126216668"
id="yiv0251227674yqt02654">
<div
style="color:#000;background-color:#fff;font-family:HelveticaNeue-Light,
Helvetica Neue Light, Helvetica Neue, Helvetica,
Arial, Lucida Grande,
sans-serif;font-size:16px;">Using certificates
for ssh is yet another method :-) <br
clear="none">
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_67368"><span></span></div>
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_67369"> </div>
<div class="yiv0251227674signature"
id="yiv0251227674yui_3_16_0_1_1443990021550_67423">Steven
Donegan<br clear="none">
KK6IVC General Class FCC License<br
clear="none">
Silver State Car #86<br clear="none">
<a moz-do-not-send="true" rel="nofollow"
shape="rect"
class="yiv0251227674moz-txt-link-abbreviated"
target="_blank" href="http://www.sscc.us/">www.sscc.us</a></div>
<br clear="none">
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_67426"
style="font-family:HelveticaNeue-Light,
Helvetica Neue Light, Helvetica Neue,
Helvetica, Arial, Lucida Grande,
sans-serif;font-size:16px;">
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_67425"
style="font-family:HelveticaNeue, Helvetica
Neue, Helvetica, Arial, Lucida Grande,
sans-serif;font-size:16px;">
<div dir="ltr"
id="yiv0251227674yui_3_16_0_1_1443990021550_67424">
<hr size="1"> <font face="Arial" size="2">
<b><span style="font-weight:bold;">From:</span></b>
Bryan D. Boyle <a
moz-do-not-send="true" rel="nofollow"
shape="rect"
class="yiv0251227674moz-txt-link-rfc2396E"
ymailto="mailto:bdboyle@bdboyle.com"
target="_blank"
href="mailto:bdboyle@bdboyle.com"><a class="moz-txt-link-rfc2396E" href="mailto:bdboyle@bdboyle.com"><bdboyle@bdboyle.com></a></a><br
clear="none">
<b><span style="font-weight:bold;">To:</span></b>
Steven Donegan <a
moz-do-not-send="true" rel="nofollow"
shape="rect"
class="yiv0251227674moz-txt-link-rfc2396E"
ymailto="mailto:donegan@donegan.org"
target="_blank"
href="mailto:donegan@donegan.org"><a class="moz-txt-link-rfc2396E" href="mailto:donegan@donegan.org"><donegan@donegan.org></a></a>
<br clear="none">
<b><span style="font-weight:bold;">Cc:</span></b>
Steve Zingman <a moz-do-not-send="true"
rel="nofollow" shape="rect"
class="yiv0251227674moz-txt-link-rfc2396E"
ymailto="mailto:szingman@msgstor.com"
target="_blank"
href="mailto:szingman@msgstor.com"><szingman@msgstor.com></a>;
<a moz-do-not-send="true" rel="nofollow"
shape="rect"
class="yiv0251227674moz-txt-link-rfc2396E"
ymailto="mailto:app_rpt-users@ohnosec.org" target="_blank"
href="mailto:app_rpt-users@ohnosec.org">"app_rpt-users@ohnosec.org"</a>
<a moz-do-not-send="true" rel="nofollow"
shape="rect"
class="yiv0251227674moz-txt-link-rfc2396E"
ymailto="mailto:app_rpt-users@ohnosec.org" target="_blank"
href="mailto:app_rpt-users@ohnosec.org"><app_rpt-users@ohnosec.org></a>
<br clear="none">
<b><span style="font-weight:bold;">Sent:</span></b>
Monday, October 5, 2015 2:49 PM<br
clear="none">
<b><span style="font-weight:bold;">Subject:</span></b>
Re: [App_rpt-users] New Official Allstar
Distribution Released (DIAL)<br
clear="none">
</font> </div>
<div class="yiv0251227674y_msg_container"
id="yiv0251227674yui_3_16_0_1_1443990021550_67427"><br
clear="none">
<div id="yiv0251227674">
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_67429">
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_67428">Using
a jump box as you describe is one
way...not allowing SSH from the
outside adds a layer; setting up a
secue VDI capability to the jumpbox
over a vpn is yet a third way...;). </div>
<div
id="yiv0251227674AppleMailSignature"><br
clear="none">
</div>
<div
id="yiv0251227674AppleMailSignature">my
rule: if it's exposed to the net,
it's potentially vulnerable. Just
turn on your SIP port and pop some
popcorn to see...;)<br clear="none">
<br clear="none">
--
<div>Bryan</div>
<div>Sent from my iPhone 5.<span
style="font-size:13pt;">..No
electrons were harmed in the
sending of this message.</span></div>
<div><br clear="none">
<div><br clear="none">
</div>
</div>
</div>
<div
class="yiv0251227674qtdSeparateBR"><br
clear="none">
<br clear="none">
</div>
<div
class="yiv0251227674yqt0199404845"
id="yiv0251227674yqt51679">
<div><br clear="none">
On Oct 5, 2015, at 17:39, Steven
Donegan <<a
moz-do-not-send="true"
rel="nofollow" shape="rect"
ymailto="mailto:donegan@donegan.org"
target="_blank"
href="mailto:donegan@donegan.org"><a class="moz-txt-link-abbreviated" href="mailto:donegan@donegan.org">donegan@donegan.org</a></a>>
wrote:<br clear="none">
<br clear="none">
</div>
<blockquote type="cite">
<div>
<div
style="color:#000;background-color:#fff;font-family:HelveticaNeue-Light,
Helvetica Neue Light,
Helvetica Neue, Helvetica,
Arial, Lucida Grande,
sans-serif;font-size:16px;">
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_65382">Direct
root login being disallowed
IF there were no other way
to get full root privileges
(not the case here) was
considered best practice.
However in almost every case
there is a user (on Raspbian
user pi) that can simply
login, sudo -s and do
whatever they want. Yes it
puts up a small hurdle but I
don't see it as a serious
one.</div>
<div><br clear="none">
</div>
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_65659">In
short, there is almost no
setup that will allow you to
completely lock out root
with the exception of a few
well designed appliances.
And that means someone is
out there doing support to
get things resolved. This
system is not of that flavor
and root is necessary for
many things so frankly
adding a hurdle or two
really doesn't appreciably
make the system more secure.</div>
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_65660"><br
clear="none">
</div>
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_65661">Require
a long pass phrase (say 20
mixed characters or so) and
this whole thing is moot...</div>
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_65662"><br
clear="none">
</div>
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_65663">And
BTW - putting sshd on port
222 (or anything except 22)
is security by obscurity -
many tools can find standard
protocols on non-standard
ports :-) (I know, I wrote
one)<br clear="none">
</div>
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_65683"><br
clear="none">
</div>
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_65684">The
best bet is to not allow ssh
at all. If that is not
feasible then do the su or
sudo thing and/or set up an
intermediate system such
that you access a
non-privileged account on
system A, then ssh to system
B and system B will ONLY
accept ssh from system A.
Still can be beaten but it
is a bit harder...</div>
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_65685"><br
clear="none">
</div>
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_65686">And
BTW - I have done infosec
for about 20 years so I am
allowed to have an opinion
on this topic :-)<br
clear="none">
</div>
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_65327"><span></span></div>
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_65326"> </div>
<div
class="yiv0251227674signature"
id="yiv0251227674yui_3_16_0_1_1443990021550_65291">Steven Donegan<br
clear="none">
KK6IVC General Class FCC
License<br clear="none">
Silver State Car #86<br
clear="none">
<a moz-do-not-send="true"
rel="nofollow"
shape="rect"
target="_blank"
href="http://www.sscc.us/">www.sscc.us</a></div>
<br clear="none">
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_65306"
style="font-family:HelveticaNeue-Light,
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Arial, Lucida Grande,
sans-serif;font-size:16px;">
<div
id="yiv0251227674yui_3_16_0_1_1443990021550_65305"
style="font-family:HelveticaNeue,
Helvetica Neue, Helvetica,
Arial, Lucida Grande,
sans-serif;font-size:16px;">
<div dir="ltr"
id="yiv0251227674yui_3_16_0_1_1443990021550_65304">
<hr size="1"> <font
face="Arial" size="2">
<b><span
style="font-weight:bold;">From:</span></b>
Steve Zingman <<a
moz-do-not-send="true"
rel="nofollow"
shape="rect"
ymailto="mailto:szingman@msgstor.com"
target="_blank"
href="mailto:szingman@msgstor.com"><a class="moz-txt-link-abbreviated" href="mailto:szingman@msgstor.com">szingman@msgstor.com</a></a>><br
clear="none">
<b><span
style="font-weight:bold;">To:</span></b>
"<a
moz-do-not-send="true"
rel="nofollow"
shape="rect"
ymailto="mailto:app_rpt-users@ohnosec.org"
target="_blank"
href="mailto:app_rpt-users@ohnosec.org"><a class="moz-txt-link-abbreviated" href="mailto:app_rpt-users@ohnosec.org">app_rpt-users@ohnosec.org</a></a>"
<<a
moz-do-not-send="true"
rel="nofollow"
shape="rect"
ymailto="mailto:app_rpt-users@ohnosec.org"
target="_blank"
href="mailto:app_rpt-users@ohnosec.org"><a class="moz-txt-link-abbreviated" href="mailto:app_rpt-users@ohnosec.org">app_rpt-users@ohnosec.org</a></a>>
<br clear="none">
<b><span
style="font-weight:bold;">Sent:</span></b>
Monday, October 5,
2015 2:24 PM<br
clear="none">
<b><span
style="font-weight:bold;">Subject:</span></b>
[App_rpt-users] New
Official Allstar
Distribution Released
(DIAL)<br clear="none">
</font> </div>
<div
class="yiv0251227674y_msg_container"><br
clear="none">
<div id="yiv0251227674">
<div> </div>
<div>
<pre style="white-space:pre-wrap;color:rgb(0, 0, 0);font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;widows:1;word-spacing:0px;">Dave,
Let's say I agree with you. And I well may.
On most internet exposed machines, I don't even allow ssh unless I trust your address or require a VPN.
I agree is common practice to not allow it.
Now the question is why?
As John McLaughlin would say, DISCUSS!
On 10/05/2015 08:40 AM, Steve Zingman wrote:
><i> root login via SSH is now allowed
</i>
> This is a bad idea. Root should *never* be allowed to login to a system
> remotely. It's better to log in as a normal user and then become root
> via su, sudo, etc.
> - Dave
</pre>
<br clear="none">
<pre class="yiv0251227674moz-signature">--
"Anything is possible if you don't know what you are talking about."
1st Law of Logic</pre>
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<pre class="moz-signature" cols="72">--
"Anything is possible if you don't know what you are talking about."
1st Law of Logic</pre>
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