Friday, January 25, 2019

linux - How can I block a specific type of DDoS attack?

My site is being attacked and is using up all the RAM. I looked at the Apache logs and every malicious hit seems to simply be a POST request on /, which is never required by a normal user.



So I thought and wondered if there's any sort of solution or utility that will monitor my Apache logs and block every IP that performs a POST request on the site root. I'm not familiar with DDoS protection and searching didn't seem to give me an answer, so I came here.



Thanks.



Example logs:



103.3.221.202 - - [30/Sep/2012:16:02:03 +0000] "POST / HTTP/1.1" 302 485 "-" "Mozilla/5.0 (iPad; CPU OS 5_1_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9B206 Safari/7534.48.3"
122.72.80.100 - - [30/Sep/2012:16:02:03 +0000] "POST / HTTP/1.1" 302 485 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.47 Safari/536.11"

122.72.28.15 - - [30/Sep/2012:16:02:04 +0000] "POST / HTTP/1.1" 302 485 "-" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)"
210.75.120.5 - - [30/Sep/2012:16:02:04 +0000] "POST / HTTP/1.1" 302 485 "-" "Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20100101 Firefox/12.0"
122.96.59.103 - - [30/Sep/2012:16:02:04 +0000] "POST / HTTP/1.1" 302 485 "-" "Mozilla/5.0 (Linux; U; Android 2.2; fr-fr; Desire_A8181 Build/FRF91) App3leWebKit/53.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1"
122.96.59.103 - - [30/Sep/2012:16:02:04 +0000] "POST / HTTP/1.1" 302 485 "-" "Mozilla/5.0 (Linux; U; Android 2.2; fr-fr; Desire_A8181 Build/FRF91) App3leWebKit/53.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1"
122.72.124.3 - - [30/Sep/2012:16:02:04 +0000] "POST / HTTP/1.1" 302 485 "-" "Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:13.0) Gecko/20100101 Firefox/13.0.1"
122.72.112.148 - - [30/Sep/2012:16:02:04 +0000] "POST / HTTP/1.1" 302 485 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:13.0) Gecko/20100101 Firefox/13.0.1"
190.39.210.26 - - [30/Sep/2012:16:02:04 +0000] "POST / HTTP/1.0" 302 485 "-" "Mozilla/5.0 (Windows NT 6.0; rv:13.0) Gecko/20100101 Firefox/13.0.1"
210.213.245.230 - - [30/Sep/2012:16:02:04 +0000] "POST / HTTP/1.0" 302 485 "-" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)"
101.44.1.25 - - [30/Sep/2012:16:02:12 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (iPhone; CPU iPhone OS 5_1_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9B206 Safari/7534.48.3"
101.44.1.28 - - [30/Sep/2012:16:02:12 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (Windows NT 5.1; rv:13.0) Gecko/20100101 Firefox/13.0.1"

101.44.1.28 - - [30/Sep/2012:16:02:14 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (Windows NT 5.1; rv:13.0) Gecko/20100101 Firefox/13.0.1"
103.3.221.202 - - [30/Sep/2012:16:02:13 +0000] "POST / HTTP/1.1" 302 466 "-" "Mozilla/5.0 (iPad; CPU OS 5_1_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9B206 Safari/7534.48.3"
211.161.152.104 - - [30/Sep/2012:16:02:12 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"
101.44.1.25 - - [30/Sep/2012:16:02:12 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.47 Safari/536.11"
101.44.1.25 - - [30/Sep/2012:16:02:11 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.47 Safari/536.11"
211.161.152.105 - - [30/Sep/2012:16:02:12 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6"
211.161.152.105 - - [30/Sep/2012:16:02:12 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; MRA 5.8 (build 4157); .NET CLR 2.0.50727; AskTbPTV/5.11.3.15590)"
211.161.152.105 - - [30/Sep/2012:16:02:12 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; MRA 5.8 (build 4157); .NET CLR 2.0.50727; AskTbPTV/5.11.3.15590)"
101.44.1.25 - - [30/Sep/2012:16:02:12 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.47 Safari/536.11"
101.44.1.25 - - [30/Sep/2012:16:02:12 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (iPhone; CPU iPhone OS 5_1_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9B206 Safari/7534.48.3"

211.161.152.108 - - [30/Sep/2012:16:02:12 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (iPad; CPU OS 5_1_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9B206 Safari/7534.48.3"
101.44.1.28 - - [30/Sep/2012:16:02:13 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (Windows NT 5.1; rv:13.0) Gecko/20100101 Firefox/13.0.1"
211.161.152.106 - - [30/Sep/2012:16:02:11 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (Windows NT 5.1; rv:5.0.1) Gecko/20100101 Firefox/5.0.1"
103.3.221.202 - - [30/Sep/2012:16:02:13 +0000] "POST / HTTP/1.1" 302 466 "-" "Mozilla/5.0 (iPad; CPU OS 5_1_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9B206 Safari/7534.48.3"
101.44.1.28 - - [30/Sep/2012:16:02:11 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (Windows NT 5.1; rv:13.0) Gecko/20100101 Firefox/13.0.1"
211.161.152.105 - - [30/Sep/2012:16:02:12 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; MRA 5.8 (build 4157); .NET CLR 2.0.50727; AskTbPTV/5.11.3.15590)"
211.161.152.104 - - [30/Sep/2012:16:02:12 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"
211.161.152.104 - - [30/Sep/2012:16:02:12 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"
211.161.152.105 - - [30/Sep/2012:16:02:12 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6"
101.44.1.25 - - [30/Sep/2012:16:02:10 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.47 Safari/536.11"

122.72.124.2 - - [30/Sep/2012:16:02:17 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (Windows NT 5.1; rv:13.0) Gecko/20100101 Firefox/13.0.1"
122.72.124.2 - - [30/Sep/2012:16:02:11 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (Windows NT 5.1; rv:13.0) Gecko/20100101 Firefox/13.0.1"
122.72.124.2 - - [30/Sep/2012:16:02:17 +0000] "POST / HTTP/1.1" 302 522 "-" "Mozilla/5.0 (Windows NT 5.1; rv:13.0) Gecko/20100101 Firefox/13.0.1"
210.213.245.230 - - [30/Sep/2012:16:02:12 +0000] "POST / HTTP/1.0" 302 522 "-" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)"


iptables -L:



Chain INPUT (policy ACCEPT)
target     prot opt source               destination         


Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination


-




bui@debian:~$ sudo iptables -I INPUT 1 -m string --algo bm --string 'Keep-Alive: 300' -j DROP
iptables: No chain/target/match by that name.
bui@debian:~$ sudo iptables -A INPUT -m string --algo bm --string 'Keep-Alive: 300' -j DROP
iptables: No chain/target/match by that name.
-

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