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Can not block countries in CSF firewall

https://mail.forum.configserver.com/viewtopic.php?t=8974

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Can not block countries in CSF firewall

Posted: 20 Sep 2015, 10:37
by tfetfe
I have blocked several countries in csf.conf file. Restarted CSF/LFD.

Code: Select all

CC_DENY = "CN,BR,CA,HK,TW,RO,RU,UA,MD,KZ,TH"
IWhen I check the Nginx logfile it shows the following:

Code: Select all

61.135.190.69 - - [17/Sep/2015:05:23:41 +0100] "GET /s5.css HTTP/1.1" 403 198 "-" "Mozilla/4.0 (comptible; MSIE 8.0; Windows NT 6.0)"
 158.69.27.74 - - [17/Sep/2015:09:42:36 +0100] "GET / HTTP/1.1" 403 570 "-" "Mozilla/5.0 (Windows NT 5.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36"
111.206.36.132 - - [20/Sep/2015:05:47:28 +0100] "GET /s5.css HTTP/1.1" 403 198 "-" "Mozilla/4.0 (comptible; MSIE 8.0; Windows NT 6.0)"

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61.135.190.69 - China
158.69.27.74 - Canada
111.206.36.132 - China
The logfile id full of connections from China and other blocked countries.
Any ideas why my CSF does not block connections from blocked countries? What I am doing wrong?

Code: Select all

 perl /usr/local/csf/bin/csftest.pl
Testing ip_tables/iptable_filter...OK
Testing ipt_LOG...OK
Testing ipt_multiport/xt_multiport...OK
Testing ipt_REJECT...OK
Testing ipt_state/xt_state...OK
Testing ipt_limit/xt_limit...OK
Testing ipt_recent...OK
Testing xt_connlimit...OK
Testing ipt_owner/xt_owner...OK
Testing iptable_nat/ipt_REDIRECT...OK
Testing iptable_nat/ipt_DNAT...OK

RESULT: csf should function on this server

Code: Select all

 csf -r
Flushing chain `INPUT'
Flushing chain `FORWARD'
Flushing chain `OUTPUT'
Flushing chain `ALLOWIN'
Flushing chain `ALLOWOUT'
Flushing chain `CC_DENY'
Flushing chain `DENYIN'
Flushing chain `DENYOUT'
Flushing chain `INVALID'
Flushing chain `INVDROP'
Flushing chain `LOCALINPUT'
Flushing chain `LOCALOUTPUT'
Flushing chain `LOGDROPIN'
Flushing chain `LOGDROPOUT'
Flushing chain `PREROUTING'
Flushing chain `INPUT'
Flushing chain `OUTPUT'
Flushing chain `POSTROUTING'
Deleting chain `ALLOWIN'
Deleting chain `ALLOWOUT'
Deleting chain `CC_DENY'
Deleting chain `DENYIN'
Deleting chain `DENYOUT'
Deleting chain `INVALID'
Deleting chain `INVDROP'
Deleting chain `LOCALINPUT'
Deleting chain `LOCALOUTPUT'
Deleting chain `LOGDROPIN'
Deleting chain `LOGDROPOUT'
Flushing chain `INPUT'
Flushing chain `FORWARD'
Flushing chain `OUTPUT'
Flushing chain `ALLOWIN'
Flushing chain `ALLOWOUT'
Flushing chain `CC_DENY'
Flushing chain `DENYIN'
Flushing chain `DENYOUT'
Flushing chain `INVALID'
Flushing chain `INVDROP'
Flushing chain `LOCALINPUT'
Flushing chain `LOCALOUTPUT'
Flushing chain `LOGDROPIN'
Flushing chain `LOGDROPOUT'
Deleting chain `ALLOWIN'
Deleting chain `ALLOWOUT'
Deleting chain `CC_DENY'
Deleting chain `DENYIN'
Deleting chain `DENYOUT'
Deleting chain `INVALID'
Deleting chain `INVDROP'
Deleting chain `LOCALINPUT'
Deleting chain `LOCALOUTPUT'
Deleting chain `LOGDROPIN'
Deleting chain `LOGDROPOUT'
csf: FASTSTART loading DROP no logging (IPv4)
csf: FASTSTART loading DROP no logging (IPv6)
LOG  tcp opt -- in * out *  0.0.0.0/0  -> 0.0.0.0/0   limit: avg 30/min burst 5 LOG flags 0 level 4 prefix "Firewall: *TCP_IN Blocked* "
LOG  tcp opt -- in * out *  0.0.0.0/0  -> 0.0.0.0/0   tcpflags: 0x17/0x02 limit: avg 30/min burst 5 LOG flags 8 level 4 prefix "Firewall: *TCP_OUT Blocked* "
LOG  udp opt -- in * out *  0.0.0.0/0  -> 0.0.0.0/0   limit: avg 30/min burst 5 LOG flags 0 level 4 prefix "Firewall: *UDP_IN Blocked* "
LOG  udp opt -- in * out *  0.0.0.0/0  -> 0.0.0.0/0   limit: avg 30/min burst 5 LOG flags 8 level 4 prefix "Firewall: *UDP_OUT Blocked* "
LOG  icmp opt -- in * out *  0.0.0.0/0  -> 0.0.0.0/0   limit: avg 30/min burst 5 LOG flags 0 level 4 prefix "Firewall: *ICMP_IN Blocked* "
LOG  icmp opt -- in * out *  0.0.0.0/0  -> 0.0.0.0/0   limit: avg 30/min burst 5 LOG flags 8 level 4 prefix "Firewall: *ICMP_OUT Blocked* "
LOG  tcp opt    in * out *  ::/0  -> ::/0   limit: avg 30/min burst 5 LOG flags 0 level 4 prefix "Firewall: *TCP6IN Blocked* "
LOG  tcp opt    in * out *  ::/0  -> ::/0   tcpflags: 0x17/0x02 limit: avg 30/min burst 5 LOG flags 8 level 4 prefix "Firewall: *TCP6OUT Blocked* "
LOG  udp opt    in * out *  ::/0  -> ::/0   limit: avg 30/min burst 5 LOG flags 0 level 4 prefix "Firewall: *UDP6IN Blocked* "
LOG  udp opt    in * out *  ::/0  -> ::/0   limit: avg 30/min burst 5 LOG flags 8 level 4 prefix "Firewall: *UDP6OUT Blocked* "
LOG  icmpv6 opt    in * out *  ::/0  -> ::/0   limit: avg 30/min burst 5 LOG flags 0 level 4 prefix "Firewall: *ICMP6IN Blocked* "
LOG  icmpv6 opt    in * out *  ::/0  -> ::/0   limit: avg 30/min burst 5 LOG flags 8 level 4 prefix "Firewall: *ICMP6OUT Blocked* "
DROP  all opt -- in * out *  0.0.0.0/0  -> 0.0.0.0/0
DROP  all opt -- in * out *  0.0.0.0/0  -> 0.0.0.0/0
DROP  all opt    in * out *  ::/0  -> ::/0
DROP  all opt    in * out *  ::/0  -> ::/0
DENYOUT  all opt -- in * out !lo  0.0.0.0/0  -> 0.0.0.0/0
DENYIN  all opt -- in !lo out *  0.0.0.0/0  -> 0.0.0.0/0
ALLOWOUT  all opt -- in * out !lo  0.0.0.0/0  -> 0.0.0.0/0
ALLOWIN  all opt -- in !lo out *  0.0.0.0/0  -> 0.0.0.0/0
DENYOUT  all opt    in * out !lo  ::/0  -> ::/0
DENYIN  all opt    in !lo out *  ::/0  -> ::/0
ALLOWOUT  all opt    in * out !lo  ::/0  -> ::/0
ALLOWIN  all opt    in !lo out *  ::/0  -> ::/0
csf: FASTSTART loading Packet Filter (IPv4)
csf: FASTSTART loading Packet Filter (IPv6)
DROP  all opt -- in * out *  0.0.0.0/0  -> 0.0.0.0/0
INVALID  tcp opt -- in !lo out *  0.0.0.0/0  -> 0.0.0.0/0
INVALID  tcp opt -- in * out !lo  0.0.0.0/0  -> 0.0.0.0/0
DROP  all opt    in * out *  ::/0  -> ::/0
INVALID  tcp opt    in !lo out *  ::/0  -> ::/0
INVALID  tcp opt    in * out !lo  ::/0  -> ::/0
csf: FASTSTART loading csf.deny (IPv4)
csf: FASTSTART loading csf.deny (IPv6)
csf: FASTSTART loading csf.allow (IPv4)
csf: FASTSTART loading CC_DENY [cn] (IPv4)
csf: FASTSTART loading CC_DENY [br] (IPv4)
csf: FASTSTART loading CC_DENY [ca] (IPv4)
csf: FASTSTART loading CC_DENY [hk] (IPv4)
csf: FASTSTART loading CC_DENY [tw] (IPv4)
csf: FASTSTART loading CC_DENY [ro] (IPv4)
csf: FASTSTART loading CC_DENY [ru] (IPv4)
csf: FASTSTART loading CC_DENY [ua] (IPv4)
csf: FASTSTART loading CC_DENY [md] (IPv4)
csf: FASTSTART loading CC_DENY [kz] (IPv4)
csf: FASTSTART loading CC_DENY [th] (IPv4)
CC_DENY  all opt -- in !lo out *  0.0.0.0/0  -> 0.0.0.0/0
CC_DENY  all opt    in !lo out *  ::/0  -> ::/0
ACCEPT  all opt -- in !lo out *  0.0.0.0/0  -> 0.0.0.0/0   ctstate RELATED,ESTABLISHED
ACCEPT  all opt -- in * out !lo  0.0.0.0/0  -> 0.0.0.0/0   ctstate RELATED,ESTABLISHED
ACCEPT  all opt    in !lo out *  ::/0  -> ::/0   ctstate RELATED,ESTABLISHED
ACCEPT  all opt    in * out !lo  ::/0  -> ::/0   ctstate RELATED,ESTABLISHED
csf: FASTSTART loading TCP_IN (IPv4)
csf: FASTSTART loading TCP6_IN (IPv6)
csf: FASTSTART loading TCP_OUT (IPv4)
csf: FASTSTART loading TCP6_OUT (IPv6)
csf: FASTSTART loading UDP_IN (IPv4)
csf: FASTSTART loading UDP6_IN (IPv6)
csf: FASTSTART loading UDP_OUT (IPv4)
csf: FASTSTART loading UDP6_OUT (IPv6)
ACCEPT  icmp opt -- in !lo out *  0.0.0.0/0  -> 0.0.0.0/0   icmptype 8 limit: avg 1/sec burst 5
ACCEPT  icmp opt -- in * out !lo  0.0.0.0/0  -> 0.0.0.0/0   icmptype 0
ACCEPT  icmp opt -- in * out !lo  0.0.0.0/0  -> 0.0.0.0/0   icmptype 8
ACCEPT  icmp opt -- in !lo out *  0.0.0.0/0  -> 0.0.0.0/0   icmptype 0 limit: avg 1/sec burst 5
ACCEPT  icmp opt -- in !lo out *  0.0.0.0/0  -> 0.0.0.0/0   icmptype 11
ACCEPT  icmp opt -- in !lo out *  0.0.0.0/0  -> 0.0.0.0/0   icmptype 3
ACCEPT  icmp opt -- in * out !lo  0.0.0.0/0  -> 0.0.0.0/0   icmptype 11
ACCEPT  icmp opt -- in * out !lo  0.0.0.0/0  -> 0.0.0.0/0   icmptype 3
ACCEPT  icmpv6 opt    in !lo out *  ::/0  -> ::/0
ACCEPT  icmpv6 opt    in * out !lo  ::/0  -> ::/0
ACCEPT  all opt -- in lo out *  0.0.0.0/0  -> 0.0.0.0/0
ACCEPT  all opt -- in * out lo  0.0.0.0/0  -> 0.0.0.0/0
LOGDROPOUT  all opt -- in * out !lo  0.0.0.0/0  -> 0.0.0.0/0
LOGDROPIN  all opt -- in !lo out *  0.0.0.0/0  -> 0.0.0.0/0
ACCEPT  all opt    in lo out *  ::/0  -> ::/0
ACCEPT  all opt    in * out lo  ::/0  -> ::/0
LOGDROPOUT  all opt    in * out !lo  ::/0  -> ::/0
LOGDROPIN  all opt    in !lo out *  ::/0  -> ::/0
csf: FASTSTART loading DNS (IPv4)
csf: FASTSTART loading DNS (IPv6)
LOCALOUTPUT  all opt -- in * out !lo  0.0.0.0/0  -> 0.0.0.0/0
LOCALINPUT  all opt -- in !lo out *  0.0.0.0/0  -> 0.0.0.0/0
LOCALOUTPUT  all opt    in * out !lo  ::/0  -> ::/0
LOCALINPUT  all opt    in !lo out *  ::/0  -> ::/0

Re: Can not block countries in CSF firewall

Posted: 22 Sep 2015, 13:30
by tfetfe
I am the only person who has this problem?

Re: Can not block countries in CSF firewall

Posted: 24 Sep 2015, 14:31
by maever
Hello tfetfe,

I would like to point out the following:
Country Code to CIDR allow/deny. In the following two options you can allow
or deny whole country CIDR ranges. The CIDR blocks are generated from the
Maxmind GeoLite Country database http://www.maxmind.com/app/geolitecountry
and entirely relies on that service being available
and
WARNING: These lists are never 100% accurate and some ISP's (e.g. AOL) use
non-geographic IP address designations for their clients
If your server is unable to fetch the maxmind geolite databases it wont load the chain beyond this the lists maxmind supplies are not a 100% accurate.

The best test would probably be to load your firewall chain and then test through pingdom (worldwide ping) to see if it has any effect https://asm.ca.com/en/ping.php .

Personally I would not recommend blocking countries in this fashion, for one you get a lot of network overhead and it rarely ever solves the underlying problem (nor does it contribute to make anything "safer"). CSF allows monitoring logs and issuing specific bans for specific violations (e.g. following honeypot urls or failing htaccess logins more than 5x). I've had servers permaban ips in huge chains over the years rather I now prefer to only ever temp ban preventing any effective method of probing or bruteforcing my servers.

hope it helps
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