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hackers

 

 

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sejo at gentoo

Oct 10, 2005, 2:52 AM

Post #1 of 14 (2005 views)
Permalink
hackers

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hey all,


ok one off my servers i keep on getting one iprange that tries to
login through ssh (200-300) attemps with other usernames.
This is probably a script that's being ran all the time, but the isp
doesn't mind, i allready sent my logs and my complaints and i don't
get any response.
Is there something like hackerwatch that i can send those logs to
(preferrably automatically) when happening?
I've blocked the range now so isn't a problem but hate it that the isp
doesn nothing against it.

greetings,

SeJo

- --
"Defer no time, delays have dangerous ends"

Jochen Maes
Gentoo Linux
Gentoo Belgium
http://sejo.be
http://gentoo.be
http://gentoo.org
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.2 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFDSjnYMXMsRNMHhmARAoXVAJ92bRcBAO04hIUk2VgBOcpm1gm9cgCgmNHe
ZPNqAHab5fXLdx11vdod5rc=
=35Kg
-----END PGP SIGNATURE-----

--
gentoo-security [at] gentoo mailing list


christophe at garault

Oct 10, 2005, 3:19 AM

Post #2 of 14 (1961 views)
Permalink
Re: hackers [In reply to]

Jochen Maes a écrit :

>Is there something like hackerwatch that i can send those logs to
>(preferrably automatically) when happening?
>
>
Yes, have a look to Dshield: http://www.dshield.org/

--
Christophe Garault


--
gentoo-security [at] gentoo mailing list


APerez at cds

Oct 11, 2005, 5:21 AM

Post #3 of 14 (1965 views)
Permalink
Re: hackers [In reply to]

I have a question:

Is there an application/program which can send an email whenever this
ssh attack happen?

A few months ago I got 300 attempts which made me close ssh port
and stop using it for a while.

Thanks

Alfredito




Jochen Maes <sejo [at] gentoo>
10/10/2005 05:52 AM
Please respond to
gentoo-security [at] lists


To
gentoo-security [at] lists
cc

Subject
[gentoo-security] hackers






-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hey all,


ok one off my servers i keep on getting one iprange that tries to
login through ssh (200-300) attemps with other usernames.
This is probably a script that's being ran all the time, but the isp
doesn't mind, i allready sent my logs and my complaints and i don't
get any response.
Is there something like hackerwatch that i can send those logs to
(preferrably automatically) when happening?
I've blocked the range now so isn't a problem but hate it that the isp
doesn nothing against it.

greetings,

SeJo

- --
"Defer no time, delays have dangerous ends"

Jochen Maes
Gentoo Linux
Gentoo Belgium
http://sejo.be
http://gentoo.be
http://gentoo.org
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.2 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFDSjnYMXMsRNMHhmARAoXVAJ92bRcBAO04hIUk2VgBOcpm1gm9cgCgmNHe
ZPNqAHab5fXLdx11vdod5rc=
=35Kg
-----END PGP SIGNATURE-----

--
gentoo-security [at] gentoo mailing list


scook at kinex

Oct 11, 2005, 5:24 AM

Post #4 of 14 (1968 views)
Permalink
RE: hackers [In reply to]

Yes, you can set up triggers in syslog-ng that will trigger based on failed
ssh login attempts.



filter f_ssh_login_attempt {

program("sshd.*")

and match("(Failed|Accepted)")

and not match("Accepted (hostbased|publickey) for (root|zoneaxfr)
from (10.4.3.1)");

};



log {

source(src);

filter(f_ssh_login_attempt);

destination(mail-alert-perl);

};

destination mail-alert-perl { program("/usr/local/bin/syslog-mail-perl"); };



Sean



_____

From: APerez [at] cds [mailto:APerez [at] cds]
Sent: Tuesday, October 11, 2005 8:22 AM
To: gentoo-security [at] lists
Subject: Re: [gentoo-security] hackers




I have a question:

Is there an application/program which can send an email whenever this
ssh attack happen?

A few months ago I got 300 attempts which made me close ssh port
and stop using it for a while.

Thanks

Alfredito





Jochen Maes <sejo [at] gentoo>

10/10/2005 05:52 AM


Please respond to
gentoo-security [at] lists


To

gentoo-security [at] lists


cc




Subject

[gentoo-security] hackers











-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hey all,


ok one off my servers i keep on getting one iprange that tries to
login through ssh (200-300) attemps with other usernames.
This is probably a script that's being ran all the time, but the isp
doesn't mind, i allready sent my logs and my complaints and i don't
get any response.
Is there something like hackerwatch that i can send those logs to
(preferrably automatically) when happening?
I've blocked the range now so isn't a problem but hate it that the isp
doesn nothing against it.

greetings,

SeJo

- --
"Defer no time, delays have dangerous ends"

Jochen Maes
Gentoo Linux
Gentoo Belgium
http://sejo.be
http://gentoo.be
http://gentoo.org
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.2 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFDSjnYMXMsRNMHhmARAoXVAJ92bRcBAO04hIUk2VgBOcpm1gm9cgCgmNHe
ZPNqAHab5fXLdx11vdod5rc=
=35Kg
-----END PGP SIGNATURE-----

--
gentoo-security [at] gentoo mailing list


taskara at internode

Oct 11, 2005, 5:25 AM

Post #5 of 14 (1968 views)
Permalink
Re: hackers [In reply to]

APerez [at] cds wrote:

> A few months ago I got 300 attempts which made me close ssh port
> and stop using it for a while.

Why not change the external port to something other than 22?
Most of these attempts are scripts and only check the default port.

-c

>
> Thanks
>
> Alfredito
>

--
gentoo-security [at] gentoo mailing list


o.schad at web

Oct 11, 2005, 5:32 AM

Post #6 of 14 (1967 views)
Permalink
Re: hackers [In reply to]

APerez [at] cds wrote:
>
> I have a question:
>
> Is there an application/program which can send an email whenever this
> ssh attack happen?

Yes, you need grep, mail, wc and a counter. But you don't want to do
this. I count round about 65000 failed login attempts in last 6 month.

> A few months ago I got 300 attempts which made me close ssh port
> and stop using it for a while.

You need good passwords to be secure. That's all.

Best regards
Oli

--
gentoo-security [at] gentoo mailing list


klieber at gentoo

Oct 11, 2005, 5:42 AM

Post #7 of 14 (1969 views)
Permalink
Re: hackers [In reply to]

On Tue, Oct 11, 2005 at 08:21:39AM -0400 or thereabouts, APerez [at] cds wrote:
> Is there an application/program which can send an email whenever this
> ssh attack happen?

Yes, Tenshi does exactly that.

http://www.gentoo.org/proj/en/infrastructure/tenshi/

We use it to receive summaries of all the various SSH attacks that hit our
servers, as well as several other log events that are of interest to us.

--kurt


cyril at toysnet

Oct 11, 2005, 5:43 AM

Post #8 of 14 (1965 views)
Permalink
Re: hackers [In reply to]

Jochen Maes wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hey all,
>
>
> ok one off my servers i keep on getting one iprange that tries to
> login through ssh (200-300) attemps with other usernames.
> This is probably a script that's being ran all the time, but the isp
> doesn't mind, i allready sent my logs and my complaints and i don't
> get any response.
> Is there something like hackerwatch that i can send those logs to
> (preferrably automatically) when happening?
> I've blocked the range now so isn't a problem but hate it that the isp
> doesn nothing against it.

have a look to fail2ban..

diabolo prod # emerge -s fail2ban
Searching...
[ Results for search key : fail2ban ]
[ Applications found : 1 ]

* net-firewall/fail2ban
Latest version available: 0.5.4
Latest version installed: 0.5.4
Size of downloaded files: 18 kB
Homepage: http://sourceforge.net/projects/fail2ban
Description: Bans IP that make too many password failures
License: GPL-2

>
> greetings,
>
> SeJo
>
> - --
> "Defer no time, delays have dangerous ends"
>
> Jochen Maes Gentoo Linux
> Gentoo Belgium
> http://sejo.be
> http://gentoo.be
> http://gentoo.org
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.2 (GNU/Linux)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
>
> iD8DBQFDSjnYMXMsRNMHhmARAoXVAJ92bRcBAO04hIUk2VgBOcpm1gm9cgCgmNHe
> ZPNqAHab5fXLdx11vdod5rc=
> =35Kg
> -----END PGP SIGNATURE-----
>

--
gentoo-security [at] gentoo mailing list


dark at w00p

Oct 11, 2005, 6:21 AM

Post #9 of 14 (1971 views)
Permalink
Re: hackers [In reply to]

For the task of banning people trying to force their way into my server
I use the following combination:

portsentry + logwatch (and a bit of iptables to restrict access to
certain servers to certain clients).

portsentry will monitor certain ports and check for known attacks (the
SSH attack and port scan is among those) and given some rules it will
put the IP/hostname into the /etc/hosts.deny file and thus make sure
that they wont be able to gain access to the machine (with some other
techniques they wont even be able to SEE the machine!).

logwatch mails me a summary of the most important logs every day (I've
set my system to do it around midnight - just after my logsystem changes
logfile). So I know how much diskspace is left, how much bandwidth I've
used for the day, how many SSH login attempts there were (succesful,
unsuccesful and which accounts were tried), etc.

Angel ~ # emerge -s portsentry
Searching...
[ Results for search key : portsentry ]
[ Applications found : 1 ]

* net-analyzer/portsentry
Latest version available: 1.2
Latest version installed: [ Not Installed ]
Size of downloaded files: 46 kB
Homepage: http://sourceforge.net/projects/sentrytools/
Description: Automated port scan detector and response tool
License: GPL-2


Angel ~ # emerge -s logwatch
Searching...
[ Results for search key : logwatch ]
[ Applications found : 3 ]

...
* sys-apps/logwatch
Latest version available: 6.0.2
Latest version installed: 6.0.2
Size of downloaded files: 149 kB
Homepage: http://www.logwatch.org/
Description: Analyzes and Reports on system logs
License: MIT
...


This is nice and stable - if you configure your portsentry a bit
(remember to add your own IP as an exception - otherwise you MIGHT just
lock yourself out of the box if you do some security auditing ;-) ).

Just my .02 on this subject. I've been using this for a while - and it
definently does what it's supposed to do!

/Jakob Rosenlund

woody wrote:

> Jochen Maes wrote:
>
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> Hey all,
>>
>>
>> ok one off my servers i keep on getting one iprange that tries to
>> login through ssh (200-300) attemps with other usernames.
>> This is probably a script that's being ran all the time, but the isp
>> doesn't mind, i allready sent my logs and my complaints and i don't
>> get any response.
>> Is there something like hackerwatch that i can send those logs to
>> (preferrably automatically) when happening?
>> I've blocked the range now so isn't a problem but hate it that the isp
>> doesn nothing against it.
>
>
> have a look to fail2ban..
>
> diabolo prod # emerge -s fail2ban
> Searching...
> [ Results for search key : fail2ban ]
> [ Applications found : 1 ]
>
> * net-firewall/fail2ban
> Latest version available: 0.5.4
> Latest version installed: 0.5.4
> Size of downloaded files: 18 kB
> Homepage: http://sourceforge.net/projects/fail2ban
> Description: Bans IP that make too many password failures
> License: GPL-2
>
>>
>> greetings,
>>
>> SeJo
>>
>> - --
>> "Defer no time, delays have dangerous ends"
>>
>> Jochen Maes Gentoo Linux
>> Gentoo Belgium
>> http://sejo.be
>> http://gentoo.be
>> http://gentoo.org
>> -----BEGIN PGP SIGNATURE-----
>> Version: GnuPG v1.4.2 (GNU/Linux)
>> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
>>
>> iD8DBQFDSjnYMXMsRNMHhmARAoXVAJ92bRcBAO04hIUk2VgBOcpm1gm9cgCgmNHe
>> ZPNqAHab5fXLdx11vdod5rc=
>> =35Kg
>> -----END PGP SIGNATURE-----
>>
>
--
gentoo-security [at] gentoo mailing list


user00265 at gmail

Oct 11, 2005, 6:25 AM

Post #10 of 14 (1963 views)
Permalink
Re: hackers [In reply to]

fail2ban is not on the Portage tree, you need to install it manually or via
a ebuild on a overlay, this was discussed in another thread in this mailing
list.

As per another discussion in this list, what you have to do is:

- create a local overlay: /usr/local/portage and then net-firewall/fail2ban
- declare this overlay in you make.conf
- copy fail2ban-0.5.4.ebuild (see below) into
/usr/local/portage/net-firewall/fail2ban/
- create an new directory under fail2ban called 'files'
- copy fail2ban-0.5.4.tar.bz2 from sourceforge into this new directory
- run "ebuild fail2ban-0.5.4.ebuild digest"

And then simply emerge fail2ban.

Here is the ebuild:
-----------------------------
# Distributed under the terms of the GNU General Public License v2

DESCRIPTION="Bans IP that make too many password failures"
HOMEPAGE="http://sourceforge.net/projects/fail2ban"
SRC_URI="mirror://sourceforge/fail2ban/${P}.tar.bz2<mirror://sourceforge/fail2ban/$%7BP%7D.tar.bz2>
"
LICENSE="GPL-2"
SLOT="0"
KEYWORDS="~x86 ~amd64"
IUSE=""
DEPEND=">=dev-lang/python-2.3"

src_install() {
# Use python setup
python setup.py install --root=${D} || die

# Use fail2ban.conf.default as default config file
insinto /etc
newins config/fail2ban.conf.default fail2ban.conf
# Install initd scripts
exeinto /etc/init.d
newexe config/gentoo-initd fail2ban
insinto /etc/conf.d
newins config/gentoo-confd fail2ban
# Doc
doman man/*.[0-9]
dodoc CHANGELOG README TODO
}

pkg_postinst() {
# The user must edit the config file
echo ""
einfo "Please edit /etc/fail2ban.conf with parameters"
einfo "which correspond to your system."
echo ""
}


On 10/11/05, woody < cyril [at] toysnet> wrote:
>
> Jochen Maes wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > Hey all,
> >
> >
> > ok one off my servers i keep on getting one iprange that tries to
> > login through ssh (200-300) attemps with other usernames.
> > This is probably a script that's being ran all the time, but the isp
> > doesn't mind, i allready sent my logs and my complaints and i don't
> > get any response.
> > Is there something like hackerwatch that i can send those logs to
> > (preferrably automatically) when happening?
> > I've blocked the range now so isn't a problem but hate it that the isp
> > doesn nothing against it.
>
> have a look to fail2ban..
>
> diabolo prod # emerge -s fail2ban
> Searching...
> [ Results for search key : fail2ban ]
> [ Applications found : 1 ]
>
> * net-firewall/fail2ban
> Latest version available: 0.5.4
> Latest version installed: 0.5.4
> Size of downloaded files: 18 kB
> Homepage: http://sourceforge.net/projects/fail2ban
> Description: Bans IP that make too many password failures
> License: GPL-2
>
> >
> > greetings,
> >
> > SeJo
> >
> > - --
> > "Defer no time, delays have dangerous ends"
> >
> > Jochen Maes Gentoo Linux
> > Gentoo Belgium
> > http://sejo.be
> > http://gentoo.be
> > http://gentoo.org
> > -----BEGIN PGP SIGNATURE-----
> > Version: GnuPG v1.4.2 (GNU/Linux)
> > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
> >
> > iD8DBQFDSjnYMXMsRNMHhmARAoXVAJ92bRcBAO04hIUk2VgBOcpm1gm9cgCgmNHe
> > ZPNqAHab5fXLdx11vdod5rc=
> > =35Kg
> > -----END PGP SIGNATURE-----
> >
>
> --
> gentoo-security [at] gentoo mailing list
>
>


erikerik at gmail

Oct 11, 2005, 7:44 AM

Post #11 of 14 (1967 views)
Permalink
Re: hackers [In reply to]

On 10/11/05, APerez [at] cds <APerez [at] cds> wrote:
>
> I have a question:
>
> Is there an application/program which can send an email whenever this
> ssh attack happen?

You've already received a few other suggestions, but I thought I'd
throw my personal favorite into the mix:

http://denyhosts.sf.net

An ebuild was recently added for denyhosts, but it's masked currently
(~x86). I'm using it on many servers and haven't run into any
problems as of yet.

-Erik

--
gentoo-security [at] gentoo mailing list


binaural at gmail

Oct 11, 2005, 8:52 AM

Post #12 of 14 (1966 views)
Permalink
Re: hackers [In reply to]

On 10/11/05, Erik Anderson <erikerik [at] gmail> wrote:
> On 10/11/05, APerez [at] cds <APerez [at] cds> wrote:
> >
> > I have a question:
> >
> > Is there an application/program which can send an email whenever this
> > ssh attack happen?
>
> You've already received a few other suggestions, but I thought I'd
> throw my personal favorite into the mix:
>
> http://denyhosts.sf.net
>
> An ebuild was recently added for denyhosts, but it's masked currently
> (~x86). I'm using it on many servers and haven't run into any
> problems as of yet.
>
> -Erik
>
> --
> gentoo-security [at] gentoo mailing list
>
>

I hacked up a little something to do exactly that--send emails... You
might think it sucks, but hey, I'm an amateur! It does work, though...
:-)

http://transplant.dyndns.org/sv/strange_vagaries_codex/rubysyslog-ng-qmail-inject-handler/

Be forewarned that it relies upon a rather strict set of
requirements--ruby, syslog-ng, and qmail. It could concievably be
modified to fit other modes, but why wouldn't you want to use that
combination? It's the best...

/NKT

--
gentoo-security [at] gentoo mailing list


robert at sixthings

Oct 11, 2005, 9:05 AM

Post #13 of 14 (1966 views)
Permalink
Re: Re: hackers [In reply to]

On Tuesday 11 October 2005 10:52 am, Noah K Tilton wrote:
> http://transplant.dyndns.org/sv/strange_vagaries_codex/rubysyslog-ng-qmail-
>inject-handler/
>
> /NKT

I can't seem to get this URL to work, I get a 404 error...

Regards,

Robert
--
gentoo-security [at] gentoo mailing list


binaural at gmail

Oct 11, 2005, 9:15 AM

Post #14 of 14 (1968 views)
Permalink
Re: hackers [In reply to]

sorry, does anyone know how to copy/paste in elinks?? I always screw
it up when I type it in.

http://transplant.dyndns.org/sv/strange_vagaries_codex/rubysyslog-ng-qmail-inject-handler/

I did it slower this time, let's see...

On 10/11/05, Robert Larson <robert [at] sixthings> wrote:
> On Tuesday 11 October 2005 10:52 am, Noah K Tilton wrote:
> >
> http://transplant.dyndns.org/sv/strange_vagaries_codex/rubysyslog-ng-qmail-
> >inject-handler/
> >
> > /NKT
>
> I can't seem to get this URL to work, I get a 404 error...
>
> Regards,
>
> Robert
> --
> gentoo-security [at] gentoo mailing list
>
>

--
gentoo-security [at] gentoo mailing list

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