Gentoo Archives: gentoo-user

From: Paul Hartman <paul.hartman+gentoo@×××××.com>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Re: Why isn't sshd blocking repeated failed login attempts?
Date: Wed, 21 Jan 2009 14:35:13
Message-Id: 58965d8a0901210635j2670c615ya760ae862125978b@mail.gmail.com
In Reply to: [gentoo-user] Re: Why isn't sshd blocking repeated failed login attempts? by Nikos Chantziaras
1 On Wed, Jan 21, 2009 at 6:36 AM, Nikos Chantziaras <realnc@×××××.de> wrote:
2 > Paul Hartman wrote:
3 >>
4 >> I'm using the online denyhosts synchronization database, I think that
5 >> may negatively affect how often it blocks hosts locally, because it
6 >> waits until it does a remote sync to scan the local file. This is my
7 >> theory. I like the idea of sharing my blocks and taking advantage of
8 >> the blocks of others, but if it renders the program ineffective
9 >> against the IP /actively/ attacking my system, then it's pointless.
10 >>
11 >> I'm going to turn off the online sharing of denyhosts and see if it
12 >> makes a difference.
13 >>
14 >> Otherwise I guess I need to set up some kind of local firewall on this
15 >> machine to get any more fine control over the connections.
16 >
17 > The shared list of attackers doesn't have anything to do with it. Denyhosts
18 > checks the logs every X seconds. I think 30 by default, not sure. In that
19 > time, there can be many more attempted logins then the maximum you have
20 > configured in Denyhosts.
21 >
22 > Also, the downloaded list of known attack hosts is copied locally into your
23 > hosts.deny file. That's all there is to it.
24
25 Then what would cause it to not add a new denied host until after many
26 many attempts?
27
28 I disabled the network sync but denyhosts still takes "forever" before
29 denying... each IP is able to do hundreds of attempts before getting
30 added to the hosts.deny file.

Replies

Subject Author
Re: [gentoo-user] Re: Why isn't sshd blocking repeated failed login attempts? Neil Bothwick <neil@××××××××××.uk>
[gentoo-user] Re: Why isn't sshd blocking repeated failed login attempts? Nikos Chantziaras <realnc@×××××.de>