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I'm sick and tired of this bad robots, spiders, crawlers and harvesters. I have already configured my server to block IP connected for 5 minutes and with maxretry of 250 using fail2ban. But still some of them cannot be intercept with 250 maxretry as they are not accessing it more than 250 within 5 minutes.

Here's my jail.local config:

[http-get-dos]
enabled = true
filter = http-get-dos
logpath = /var/log/ispconfig/httpd/*/access.log
maxretry = 250
findtime = 300
#ban for 10 hours
bantime = 36000
action = iptables-multiport[name=HTTP, port="http,https", protocol=tcp]
         cloudflare-blacklist
         sendmail-whois[name=HTTP, dest=webmaster@mysite.com]

Here's the http-get-dos.conf filter file:

[Definition]

failregex = ^<HOST> -.*"(GET|POST)

ignoreregex =

The majority of the tutorial that can block this crawler is using apache. But because I am using nginx, I cannot use them. Here's one tutorial I found.

Here's the example log of this robot:

220.225.127.41 - - [24/Jul/2013:00:00:19 +0800] "GET /php?page=9 HTTP/1.1" 200 10897 "http://www.mysite.com/php?page=8" "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36"
220.225.127.41 - - [24/Jul/2013:00:00:22 +0800] "GET /sites/default/files/download/jkev/jkev_search.zip HTTP/1.1" 200 35199 "http://www.mysite.com/sites/default/files/download/jkev/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:00:00:24 +0800] "GET /sites/default/files/styles/thumbnail/public/images/kalola/sk_3.jpg?itok=-pXuOEq2 HTTP/1.1" 200 3958 "http://www.mysite.com/php?page=9" "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36"
220.225.127.41 - - [24/Jul/2013:00:00:24 +0800] "GET /sites/default/files/styles/thumbnail/public/images/kalola/sk_1.jpg?itok=ug6jsTPP HTTP/1.1" 200 3958 "http://www.mysite.com/php?page=9" "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36"
220.225.127.41 - - [24/Jul/2013:00:00:24 +0800] "GET /sites/default/files/styles/thumbnail/public/images/kalola/sk_2.jpg?itok=ZPOMnJeK HTTP/1.1" 200 3958 "http://www.mysite.com/php?page=9" "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36"
220.225.127.41 - - [24/Jul/2013:00:00:26 +0800] "GET /sites/default/files/styles/thumbnail/public/images/argie/currency.jpg?itok=hodqOr4_ HTTP/1.1" 200 7976 "http://www.mysite.com/php?page=9" "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36"
220.225.127.41 - - [24/Jul/2013:00:00:26 +0800] "GET /sites/default/files/styles/thumbnail/public/images/localhost27/untitled.jpg?itok=uVeczDjI HTTP/1.1" 200 3136 "http://www.mysite.com/php?page=9" "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36"
220.225.127.41 - - [24/Jul/2013:00:00:26 +0800] "GET /sites/default/files/styles/thumbnail/public/images/Oelasor/screenshot_11.jpg?itok=uu3d0GpX HTTP/1.1" 200 6674 "http://www.mysite.com/php?page=9" "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36"
220.225.127.41 - - [24/Jul/2013:00:00:27 +0800] "GET /sites/default/files/styles/thumbnail/public/images/localhost27/member.jpg?itok=inA9ULoC HTTP/1.1" 200 4500 "http://www.mysite.com/php?page=9" "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36"
220.225.127.41 - - [24/Jul/2013:00:00:28 +0800] "GET /php/4852/shopping-cart-checkout-using-codeigniter.html HTTP/1.1" 200 11414 "http://www.mysite.com/php?page=9" "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36"
220.225.127.41 - - [24/Jul/2013:00:00:29 +0800] "GET /sites/default/files/styles/medium/public/images/admin/codeigniter_shopping_cart.jpg?itok=QO0YV6JP HTTP/1.1" 200 22534 "http://www.mysite.com/php/4852/shopping-cart-checkout-using-codeigniter.html" "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36"
220.225.127.41 - - [24/Jul/2013:00:00:32 +0800] "GET /php/4846/simple-ajax-example-php.html HTTP/1.1" 200 10174 "http://www.mysite.com/php?page=9" "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36"
220.225.127.41 - - [24/Jul/2013:00:00:34 +0800] "GET /sites/default/files/download/teejaygenius/e_library.zip HTTP/1.1" 206 3655400 "http://www.mysite.com/sites/default/files/download/teejaygenius/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:00:00:36 +0800] "GET /sites/default/files/download/Chritian/bus.zip HTTP/1.1" 206 4462491 "http://www.mysite.com/sites/default/files/download/Chritian/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:00:00:37 +0800] "GET /sites/default/files/styles/medium/public/images/kalola/sk_2.jpg?itok=1N0a__bq HTTP/1.1" 200 9693 "http://www.mysite.com/php/4846/simple-ajax-example-php.html" "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36"e220.225.127.41 - - [24/Jul/2013:03:03:13 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 1555432 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"                                                                                                                             220.225.127.41 - - [24/Jul/2013:03:03:20 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 18541381 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:03:29 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 6186320 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:03:31 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 13495467 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:03:34 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 17908605 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:03:51 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 10082448 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:03:57 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 8639709 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:04:03 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 12150765 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:04:04 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 17972316 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:04:09 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 18453052 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:04:23 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 777716 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:04:40 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 8033075 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:04:45 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 12935983 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:04:49 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 8262600 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:04:49 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 11598966 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:04:49 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 11249310 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:04:57 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 5969210 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:05:02 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 12978641 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:05:03 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 13390784 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:05:07 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 6124786 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:05:15 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 9962834 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:05:19 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 12021359 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:05:27 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 8432875 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:05:44 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 18371964 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:05:46 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 19867749 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:05:50 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 18164900 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:06:00 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 17839100 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:06:01 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 18329973 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:06:11 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 18651902 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:06:31 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 9858200 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:06:34 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 12914955 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:06:36 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 13315966 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:06:38 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 12804285 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:06:41 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 6043976 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:06:42 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 11900897 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:06:52 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 8293782 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:07:06 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 11582412 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:07:24 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 18667357 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:07:27 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 7977266 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:07:35 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 11190040 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:07:36 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 18555860 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:08:09 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 5932064 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:08:10 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 12730175 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:08:13 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 13208853 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:08:16 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 8178860 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:08:22 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 5896753 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:08:25 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 8183834 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:08:26 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 12671818 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:08:30 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 18581925 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:08:36 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 18224268 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:08:37 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 11761743 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:08:51 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 11412627 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:08:59 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 18600749 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:09:01 +0800] "GET /sites/default/files/download/mindgamez/system1.zip HTTP/1.1" 206 11129155 "http://www.mysite.com/sites/default/files/download/mindgamez/" "FDM 3.x"
220.225.127.41 - - [24/Jul/2013:03:09:14 +0800] "GET /sites/default/files/download/argie/tameraplazainn.zip HTTP/1.1" 206 7836467 "http://www.mysite.com/sites/default/files/download/argie/" "FDM 3.x"

Here's the frequency of visits by hour:

# grep "220.225.127.41" /var/log/ispconfig/httpd/*/access.log | cut -d[ -f2 | cut -d] -f1 | awk -F: '{print $2":00"}' | sort -n | uniq -c
545 00:00
524 01:00
404 02:00
491 03:00
396 04:00
183 05:00

Here's the frequency of visits by minute (around 12 midnight):

# grep "220.225.127.41 - - \[24/Jul/2013:00" /var/log/ispconfig/httpd/*/access.log | cut -d[ -f2 | cut -d] -f1 | awk -F: '{print $2":"$3}' | sort -nk1 -nk2 | uniq -c | awk '{ if ($1 > 10) print $0}'
33 00:00
14 00:01
12 00:03
26 00:05
15 00:10
18 00:11
22 00:13
15 00:14
14 00:15
15 00:18
21 00:19
17 00:20
15 00:23
14 00:24
17 00:25
27 00:29
15 00:30
18 00:32
14 00:52

Here's the frequency of visits by minute (around 1AM):

# grep "220.225.127.41 - - \[24/Jul/2013:01" /var/log/ispconfig/httpd/*/access.log | cut -d[ -f2 | cut -d] -f1 | awk -F: '{print $2":"$3}' | sort -nk1 -nk2 | uniq -c | awk '{ if ($1 > 10) print $0}'
16 01:01
16 01:02
12 01:05
16 01:06
14 01:10
14 01:11
14 01:12
13 01:14
22 01:16
18 01:17
13 01:21
21 01:22
14 01:26
20 01:37
30 01:38
13 01:45
11 01:50
17 01:51
11 01:53

Is there a way to block this using IPTables or something?

If I will lower it, I'm afraid some of the legitimate traffic will be ban also.

The access rate is very low. I cannot set the maxretry to something like 50 or even 70. That will also ban legitimate traffic.

So how can I prevent this one? They consume too much bandwidth. Before my normal bandwidth is at 59.31 GB per day but now it reaches up to 136.74 GB.

share|improve this question
    
Check their user-agents. If they are using a specific spider-related user agent, it should be simple enough to block based on that. –  Mark Henderson Jul 24 '13 at 3:57
    
hi mark, can you give me some little guidance on where to check this? is it using fail2ban? or robots.txt? I believe robots.txt is of no use here since they can ignore it easily. –  jaYPabs Jul 24 '13 at 4:00
    
According to your log, the user-agent is FDM 3.x - see stackoverflow.com/questions/15599544/… for info on how to block. –  Mark Henderson Jul 24 '13 at 4:09
2  
You may also want to set up a honeypot... Just add an invisible link on the home page that triggers your ban if loaded. Humans will not (normally) access it as it's not visible but crawlers will. –  Chris Nava Jul 24 '13 at 4:17
1  
@MarkHenderson. User-agent is not the way to go, they can be faked very easily. The ones that don't fake are more than likely the bots you do want indexing your site –  GeoSword Jul 24 '13 at 9:16
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1 Answer

Maybe, as a first step, limiting the number of connections could help (IPTABLES):

(from http://www.extrapepperoni.com/post/2013/03/iptables%3A-connlimit):

-A INPUT -j ACCEPT -p tcp --dport    80 -s xxx.yyy.0.0/16 --syn -m connlimit ! --connlimit-above 20
-A INPUT -j ACCEPT -p tcp --dport    80                   --syn -m connlimit ! --connlimit-above 5 --connlimit-mask 24

This will mostly help against DDoS attacks, but might be part of your problem: The first rule allows internal users (from a specific network) to connect with up to 20 connections. The second rule allows everybody else to only connect with 5 connections at a time.

A more general but quite complex command line tool for traffic shaping is tc: http://www.tldp.org/HOWTO/html_single/Traffic-Control-HOWTO/

With tc you can limit the bandwidth of a particular user, service or client.

share|improve this answer
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