EMERGENCY - need to secure my server against an ongoing SPAMMER

[Roger Grosswiler]

Roger Grosswiler schrieb:
> Bob Brennan schrieb:
> [snip]
> 
>>> Probably a good idea to shut them off semi-permanently:
>>> add these lines to your iptables firewall:
>>> (Note - there are more general ways to script iptables setups)
>>> (Read "better ways", but this is a specific example)
>>>
>>> #  Next 8 lines specific to tfn.net.tw
>>> # Log any connection attempts by tfn,net.tw
>>> iptables -A INPUT  -i eth0 -s  219.81.0.0/16 -j LOG --log-prefix 
>>> "static.tfn.net.tw"
>>> iptables -A INPUT  -i eth0 -s  61.31.0.0/16 -j DROP -j LOG 
>>> --log-prefix "dynamic.tfn.net.tw "
>>>
>>> # Drop dynamic.tfn.net.tw
>>> iptables -A INPUT  -i eth0 -s  61.31.0.0/16 -j DROP
>>> # Drop static.tfn.net.tw
>>> iptables -A INPUT  -i eth0 -s  219.81.0.0/16 -j DROP
> 
> [/snip]
> 
> Hi Bob,
> 
> Good way to get the spammer of your ports ;-)
> 
> See here 2 links, where you chan check your mailserver immediately for 
> your "open relay". There is no need to register or whatever - just type 
> your ip and go. You will see if your mailserver is secure enough or 
> which methods still could be used, to send spam via your mailserver.
> 
> http://www.relaycheck.com/test.asp
> http://www.antispam-ufrj.pads.ufrj.br/
> 
> Have you built-in RBL-Support for your mailserver? This perhaps could 
> get your spammer even off your mailserver. See 3 free lists below.
> 
> bl.spamcop.net,
> relays.ordb.org,
> sbl.spamhaus.org,
> 
> btw. preferably you use by today no longer pop-before-smtp, either use 
> smtp-auth. If you authenticate your users in pop/imap against mysql you 
> COULD use the same database for smtp either.
> 
> HTH
> Roger
> 
btw. doing perror 13 in shell gives the following:

[roger at link ~]$ perror 13
Error code  13:  Permission denied

...i had this too, this was an issue from selinux. You could either 
disable mysql-support in selinux (system-config-securitylevel) or try to 
relabel your system. This helped me, in some way (...)

/sbin/fixfiles relabel

make also sure, that your /var/lib/mysql is chowned -R mysql:mysql

HTH
Roger
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