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# fw
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SIP 网络安全
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sudo apt-get install ipset fail2ban
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voipbl.sh
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```
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#!/bin/bash
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URL="https://voipbl.org/update/"
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set -e
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echo "Downloading rules from VoIP Blacklist"
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wget -qO - $URL -O /tmp/voipbl.txt
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echo "Loading rules..."
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# Check if rule set exists and create one if required
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if ! $(/sbin/ipset list voipbl > /dev/null 2>&1); then
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ipset -N voipbl iphash
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fi
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#Check if rule in iptables
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if ! $(/sbin/iptables -w --check INPUT -m set --match-set voipbl src -j DROP > /dev/null 2>&1); then
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/sbin/iptables -I INPUT 1 -m set --match-set voipbl src -j DROP
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fi
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# Create temporary chain
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ipset destroy voipbl_temp > /dev/null 2>&1 || true
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ipset -N voipbl_temp iphash hashsize 131072 maxelem 260000
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cat /tmp/voipbl.txt |\
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awk '{print "if ! [[ \""$1"\" =~ ^#$|^0.0.0.0 ]]; then /sbin/ipset -A voipbl_temp \""$1"\" ; fi;"}' | sh
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ipset swap voipbl_temp voipbl
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ipset destroy voipbl_temp || true
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echo "Done! Rules loaded"
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```
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/etc/cron.d/voipbl
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```
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# update blacklist each 4 hours
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0 */4 * * * * root /usr/local/bin/voipbl.sh
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```
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## Fail2Ban
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Fail2Ban 就是一个日志 IP 的过滤筛选器，根据不同的监狱规则从日志中找出这些“行为不端”的 IP，一旦这些 IP 发送了触犯监狱规则的请求达到阈值就会在 iptables 里直接封禁屏蔽，并且可以设置屏蔽这个 IP 的时间长久来避免误伤造成的危害过大。
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所以用好 Fail2Ban 其实最重要的就是如何根据日志制定有效的监狱规则，规则制订完了还需要测试一下这个规则是否生效了，是否真的可以起到预期的目的。
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打开编辑 nginx-not-found.conf 监狱规则文件，注意一定要在/etc/fail2ban/filter.d/目录内哦。
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```
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[Definition]
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failregex = ^<HOST>.*"(GET|POST).*" (404|444|403|400) .*$
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ignoreregex =
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```
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再打开编辑 jail.local 启用这个监狱规则。
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vim /etc/fail2ban/jail.local
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添加下面的代码到 jail.local 里即可。同样的，注意 jail.local 文件的目录哦。
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```
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[nginxno404]
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#处理 nginx 下的恶意 404 结果扫描
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enabled = true
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port = http,https
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filter = nginx-not-found
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action = iptables[name=nginxno404, port=http, protocol=tcp]
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#Fail2Ban 要监控的站点日志文件，大家可以根据自己站点来灵活调整。
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logpath = /home/wwwlogs/access.log
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/home/wwwlogs/www.imydl.com.log
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/home/wwwlogs/www.imydl.tech.log
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/home/wwwlogs/service.imydl.com.log
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/home/wwwlogs/eat.ymanz.com.log
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bantime = 3600 #默认是屏蔽 IP 地址 10 分钟
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#下面这两个是说 60 秒内 5 次 404 失败请求就开始屏蔽这个 IP 地址
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findtime = 60
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maxretry = 5
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```
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/etc/fail2ban/jail.conf
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```
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[asterisk-iptables]
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action = iptables-allports[name=ASTERISK, protocol=all]
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voipbl[serial=XXXXXXXXXX]
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```
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/etc/fail2ban/action.d/voipbl.conf.
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```
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# Description: Configuration for Fail2Ban
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[Definition]
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actionban = <getcmd> "<url>/ban/?serial=<serial>&ip=<ip>&count=<failures>"
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actionunban = <getcmd> "<url>/unban/?serial=<serial>&ip=<ip>&count=<failures>"
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[Init]
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getcmd = wget --no-verbose --tries=3 --waitretry=10 --connect-timeout=10 \
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--read-timeout=60 --retry-connrefused --output-document=- \
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--user-agent=Fail2Ban
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url = http://www.voipbl.org
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```
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