Major Bug: UFW stopped thru logrotate

On Debian Sid i have seen that ufw service is stopped on logrotate!!

Its a bad known bug!

Workaround:

  • Set all Services like Dovecot, Postfix to listen on LOCALHOST (127.0.0.1) if not needed over Internet
  • Enable ONLY encrypted AUTH (Login) to Postfix! (TLS 1.2)
  • Disable unneeded Services ! like Samba, FTP…
  • move config from /etc/logrotate.d/ufw to /root/ to disable ufw logrotate !!
  • edit /etc/ufw/ufw.conf set LOGLEVEL to „off“
  • restart the Server and check open Ports next Days from outside with:

$sudo nmap -PN my.server.com

Postfix: Automatic UFW Firewall Updates

If you use a Mail Server with Postfix you got daily Spam Attacks by Scripts:

How to fix?

  • Install ufw Firewall
  • Run a Scanner Script as  cronjob

On Debian/Ubuntu:

Install ufw:


sudo apt-get update && sudo apt-get install ufw && sudo ufw enable && sudo  ufw logging off

Scan Script:
sudo nano /home/user/firewall-update.sh:


#!/bin/bash
# scan rejected
cat /var/log/mail.log | grep rejected | cut -d"[" -f3 | cut -d"]" -f1|grep -v '^$' > /tmp/firewall.txt
# insert to Firewall
while read line; do sudo ufw insert 1 deny from $line to any; done < /tmp/firewall.txt
# scan "denied"
cat /var/log/mail.log | grep denied | cut -d"[" -f3 | cut -d"]" -f1|grep -v '^$' > /tmp/firewall2.txt
# insert to Firewall
while read line; do sudo ufw insert 1 deny from $line to any; done < /tmp/firewall2.txt
service ufw restart
exit 0

Remark:

  • add to root’s crontab run hourly
  • add lines cat..+ while.. replace rejected by other failed commands login etc..!

Test:


sudo ufw status numbered

Should echo list of banned IP’s! Screenshot of one DAY!

Status: active

To Action From
— —— —-
Anywhere DENY 87.98.131.120
Anywhere DENY 187.178.174.1
Anywhere DENY 46.148.88.115
Anywhere DENY 31.28.86.59
Anywhere DENY 200.6.213.125
Anywhere DENY 200.35.185.180
Anywhere DENY 37.49.227.221
Anywhere DENY 203.60.1.21
Anywhere DENY 78.110.2.2
Anywhere DENY 192.140.8.21
Anywhere DENY 66.240.219.146
Anywhere DENY 171.49.178.169
Anywhere DENY 186.179.219.145
Anywhere DENY 119.235.53.122
Anywhere DENY 95.177.213.224
Anywhere DENY 14.161.43.66
Anywhere DENY 203.143.23.69
Anywhere DENY 104.215.8.206
Anywhere DENY 191.96.249.84
Anywhere DENY 190.190.167.206
Anywhere DENY 95.97.176.158
Anywhere DENY 200.77.219.250
Anywhere DENY 191.248.224.38
Anywhere DENY 91.237.124.222
Anywhere DENY 31.27.32.18
Anywhere DENY 122.174.172.246
Anywhere DENY 208.92.136.194
Anywhere DENY 39.52.234.157
Anywhere DENY 202.188.23.209
Anywhere DENY 154.72.169.179
Anywhere DENY 88.247.177.95
Anywhere DENY 98.116.114.130
Anywhere DENY 203.45.1.236
Anywhere DENY 115.74.190.217
Anywhere DENY 183.129.160.229
Anywhere DENY 203.143.23.66
Anywhere DENY 201.187.101.222
Anywhere DENY 46.13.150.215
Anywhere DENY 104.215.11.242
Anywhere DENY 77.119.247.86
Anywhere DENY 94.46.187.190
Anywhere DENY 78.89.186.118
Anywhere DENY 185.218.184.95
Anywhere DENY 103.10.44.223
Anywhere DENY 167.114.226.176
Anywhere DENY 185.38.154.18
Anywhere DENY 85.105.58.91
Anywhere DENY 149.135.117.174
Anywhere DENY 104.236.166.245
Anywhere DENY 27.115.124.2
Anywhere DENY 181.60.254.53
Anywhere DENY 196.22.248.246
Anywhere DENY 165.49.18.249
Anywhere DENY 159.147.100.63
Anywhere DENY 192.95.17.132
Anywhere DENY 137.74.89.35
Anywhere DENY 193.70.87.209
Anywhere DENY 216.36.187.97
Anywhere DENY 101.187.124.125
Anywhere DENY 2.42.219.63
Anywhere DENY 185.109.169.71
Anywhere DENY 201.26.128.167
Anywhere DENY 133.130.74.177
Anywhere DENY 2.139.229.39
Anywhere DENY 177.1.7.49
Anywhere DENY 103.227.88.130
Anywhere DENY 46.102.196.66
Anywhere DENY 109.230.219.194
Anywhere DENY 180.94.114.47
Anywhere DENY 212.170.109.162
Anywhere DENY 190.24.136.122
Anywhere DENY 82.152.228.49
Anywhere DENY 181.49.39.70
Anywhere DENY 103.240.181.210
Anywhere DENY 189.51.83.246
Anywhere DENY 61.19.16.144
Anywhere DENY 45.76.95.222
Anywhere DENY 178.90.55.176
Anywhere DENY 87.139.234.44
Anywhere DENY 200.116.164.5
Anywhere DENY 24.222.140.202
Anywhere DENY 103.100.209.234
Anywhere DENY 82.201.54.152
Anywhere DENY 84.241.1.21
Anywhere DENY 110.145.123.120
Anywhere DENY 185.32.183.141
Anywhere DENY 200.49.145.161
Anywhere DENY 213.156.120.22
Anywhere DENY 95.59.137.196
Anywhere DENY 185.229.227.5
Anywhere DENY 188.225.171.58
Anywhere DENY 211.24.107.177
Anywhere DENY 186.233.80.51
Anywhere DENY 187.178.242.154
Anywhere DENY 190.223.59.18
Anywhere DENY 202.181.207.212
Anywhere DENY 41.87.95.33
Anywhere DENY 52.175.252.79
Anywhere DENY 103.252.220.20
Anywhere DENY 212.230.98.37
Anywhere DENY 41.180.72.44
Anywhere DENY 196.191.131.50
Anywhere DENY 120.150.227.127
Anywhere DENY 181.211.10.202
Anywhere DENY 218.255.233.114
Anywhere DENY 181.143.94.74
Anywhere DENY 196.38.89.85
Anywhere DENY 190.187.134.246
Anywhere DENY 76.65.196.40
Anywhere DENY 222.102.154.172
Anywhere DENY 221.121.148.77
Anywhere DENY 203.191.174.55
Anywhere DENY 190.25.46.42
Anywhere DENY 169.55.213.44
Anywhere DENY 86.16.10.224
Anywhere DENY 89.96.222.27
Anywhere DENY 202.131.203.163
Anywhere DENY 200.85.52.74
Anywhere DENY 94.23.73.132
Anywhere DENY 41.193.16.218
Anywhere DENY 175.136.232.97
Anywhere DENY 118.219.45.141
Anywhere DENY 205.151.252.203
Anywhere DENY 82.113.59.26
Anywhere DENY 178.33.107.200
Anywhere DENY 82.185.149.169
Anywhere DENY 220.130.186.101
Anywhere DENY 201.33.193.166
Anywhere DENY 178.159.36.60
Anywhere DENY 74.125.82.65
Anywhere DENY 74.125.82.67
Anywhere DENY 209.85.128.193
Anywhere DENY 209.85.128.195
Anywhere DENY 178.32.217.0/24
Anywhere DENY 74.125.82.66
Anywhere DENY 209.85.128.194
Anywhere DENY 209.85.128.196
Anywhere DENY 74.125.82.68
Anywhere DENY 104.236.142.81
Anywhere DENY 60.191.38.77
Anywhere DENY 5.101.0.34
Anywhere DENY 209.126.136.5
Anywhere DENY 145.249.104.109
Anywhere DENY 37.49.226.113
Anywhere DENY 189.112.109.185
Anywhere DENY 172.104.155.22
Anywhere DENY 23.227.207.153
Anywhere DENY 142.4.196.32
Anywhere DENY 210.72.142.7
Anywhere DENY 46.21.174.130
Anywhere DENY 13.91.5.211
Anywhere DENY 212.53.206.58
Anywhere DENY 167.114.60.66
Anywhere DENY 144.217.126.187
Anywhere DENY 144.217.210.228
Anywhere DENY 104.236.163.154
Anywhere DENY 61.236.111.38

Apache: Analyse Logs Spam Bots

If you admin a Apache Webserver, you see often weekly thousand of visits a day on your Blogs.

Background:
These are no real users, this visits are made by Spam Bots in my Logs like Xovi.de or xovibot.net Bots!
On info pages this Company says Admins should disallow crawl by robots.txt, but they IGNORE the settings!
This x-guys is in my opinion against German Law „Datenschutz“.

"Mozilla/5.0 (compatible; XoviBot/2.0; +http://www.xovibot.net/)"

Solution:

  • On Linux Setup a Firewall like ufw and block these IP Ranges
  • To find out the IPs do:

$sudo cat /var/log/apache2/access.log|grep xovibot.net| awk '{ print $2 }' | sort | uniq -c | sort -n > x.log

  • Now read x.log with cat

     46 212.224.119.143
     52 185.53.44.101
     54 212.224.119.140
     59 185.53.44.104
     62 212.224.119.142
     71 185.53.44.102
     75 185.53.44.103
     80 185.53.44.67
     80 212.224.119.141
     83 185.53.44.68
     87 185.53.44.43
     87 185.53.44.69
     96 185.53.44.70
    106 185.53.44.73
    108 185.53.44.51
    110 185.53.44.74
    113 185.53.44.55
    116 185.53.44.45
    116 185.53.44.53
    120 185.53.44.56
    131 185.53.44.71
    132 185.53.44.97
    137 185.53.44.46
    137 212.224.119.144
    141 212.224.119.182
    142 185.53.44.47
    146 185.53.44.41
    150 185.53.44.93
    152 185.53.44.188
    152 185.53.44.203
    152 185.53.44.64
    152 185.53.44.99
    153 185.53.44.184
    154 185.53.44.181
    154 185.53.44.82
    155 212.224.119.139
    156 185.53.44.92
    158 185.53.44.160
    159 185.53.44.202
    160 185.53.44.177
    160 185.53.44.178
    161 185.53.44.175
    163 185.53.44.187
    165 185.53.44.186
    166 185.53.44.189
    168 185.53.44.200
    172 185.53.44.90
    173 185.53.44.159
    173 185.53.44.72
    175 185.53.44.98
    176 185.53.44.96
    177 185.53.44.149
    179 185.53.44.157
    179 185.53.44.183
    183 185.53.44.148
    185 185.53.44.158
    185 185.53.44.63
    186 185.53.44.152
    188 185.53.44.201
    191 185.53.44.176
    191 185.53.44.80
    193 185.53.44.61
    193 185.53.44.94
    202 185.53.44.62

  • And insert the IP ranges of them into the ufw settings by:

$sudo ufw insert 1 deny from 185.53.44.0/24 to any       # insert rule
$sudo service ufw force-reload                           # force update firewall
$sudo ufw status numbered                                # test status

  • Where the „insert 1“ is important cause ufw must see first the deny entry
  • Check the logs manual weekly again with the „cat“ filter.. Kick them out!
  • Remark: This Howto works with every bot entry! There are more Marketing Scan Bots on the net!

More Infos:
http://webrobots.de/xovibot/