Am 28.03.2014 14:39, schrieb Petr Lautrbach: > On 03/20/2014 08:05 PM, Lennart Poettering wrote: >> On Thu, 20.03.14 12:20, Stephen John Smoogen (smo...@gmail.com) wrote: >> >>>> I doubt there are many people even using them anymore, firewalls are >>>> more comprehensive and a lot more powerful, and while every admin knows >>>> firewalls, I figure only very few know tcpd/tcpwrap, and even fewer ever >>>> actively make use of them... >>>> >>>> >>> Actually they are used quite a bit in various service worlds. Mainly for >>> ssh and email for dealing with scanners. [DenyHosts is a boon in this >>> area.] The reason for using a secondary tool is that depth of >>> security. >> >> Well, all mails servers as well as sshd have much better ways to do >> such filtering. sshd has "Match", Postfix for example has >> "smtpd_client_restrictions=", and so on. > > I'd like to note that you can't just replace deny.hosts using Match block in > sshd_config. > > - using libwrap, a connection is dropped before the protocol version exchange > so a client can't even check the server's > identification string. While using Match block, a client and a server > exchange id strings, negotiate the transport layer > parameters, exchange keys and establish encrypted connection.
which is *layered* security that is the same reason why "put the rules in iptables" is only a uneducated phrase and anybody who will put all his security in a single layer sooner or later regret that mistake > - every change in sshd_config has to be confirmed by sshd restart, while > changing hosts.deny doesn't need > any other action no - try it out! make a fatal syntax error in "sshd_config" and in case of a remote machine make sure you don't close the last connection because you will not reach the machine again otherwise
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