至此, 我们已经拥有了suricata可以运行的环境了.
接下来,我们来研究一下它的功能, 首先,分析一下配置文件:
/suricata/etc/suricata/suricata.yaml
可以结合着默认配置文件的内容,同时读它的描述文档: http://suricata.readthedocs.io/en/latest/configuration/suricata-yaml.html
这样更好理解.
快速浏览一遍配置之后, 基本上也就了解了suricata的主要功能. 配置项很丰富, 能力也很强大, 最简单快速的可以提供一个主管感受的方法,就是先打开http记录功能.
然后重启,会发现, 多个一个日志文件 /suricata/var/log/suricata/http.log
然后试着访问一个网页,
[root@suricata ~]# wget -q www.baidu.com
[root@suricata ~]#
该日志中,便记录下了这条http访问日志:
[root@suricata suricata]# cat /suricata/var/log/suricata/http.log 02/08/2018-10:23:02.035401 www.baidu.com[**]/[**]Wget/1.14 (linux-gnu)[**]192.168.7.8:40578 -> 61.135.169.125:80 02/08/2018-10:23:05.893547 www.baidu.com[**]/[**]Wget/1.14 (linux-gnu)[**]192.168.7.8:38082 -> 61.135.169.121:80 [root@suricata suricata]#
其他高级用法,可以结合文档, 尝试着进行修改测试, 慢慢熟悉.
另外, suricata有非常多的运行模式, 详见文档, 不做赘述
[root@suricata ~]# /suricata/usr/bin/suricata --list-runmodes ------------------------------------- Runmodes ------------------------------------------ | RunMode Type | Custom Mode | Description |---------------------------------------------------------------------------------------- | PCAP_DEV | single | Single threaded pcap live mode | --------------------------------------------------------------------- | | autofp | Multi threaded pcap live mode. Packets from each flow are assigned to a single detect thread, unlike "pcap_live_auto" where packets from the same flow can be processed by any detect thread | --------------------------------------------------------------------- | | workers | Workers pcap live mode, each thread does all tasks from acquisition to logging |---------------------------------------------------------------------------------------- | PCAP_FILE | single | Single threaded pcap file mode | --------------------------------------------------------------------- | | autofp | Multi threaded pcap file mode. Packets from each flow are assigned to a single detect thread, unlike "pcap-file-auto" where packets from the same flow can be processed by any detect thread |---------------------------------------------------------------------------------------- | PFRING(DISABLED) | autofp | Multi threaded pfring mode. Packets from each flow are assigned to a single detect thread, unlike "pfring_auto" where packets from the same flow can be processed by any detect thread | --------------------------------------------------------------------- | | single | Single threaded pfring mode | --------------------------------------------------------------------- | | workers | Workers pfring mode, each thread does all tasks from acquisition to logging |---------------------------------------------------------------------------------------- | NFQ | autofp | Multi threaded NFQ IPS mode with respect to flow | --------------------------------------------------------------------- | | workers | Multi queue NFQ IPS mode with one thread per queue |---------------------------------------------------------------------------------------- | NFLOG | autofp | Multi threaded nflog mode | --------------------------------------------------------------------- | | single | Single threaded nflog mode | --------------------------------------------------------------------- | | workers | Workers nflog mode |---------------------------------------------------------------------------------------- | IPFW | autofp | Multi threaded IPFW IPS mode with respect to flow | --------------------------------------------------------------------- | | workers | Multi queue IPFW IPS mode with one thread per queue |---------------------------------------------------------------------------------------- | ERF_FILE | single | Single threaded ERF file mode | --------------------------------------------------------------------- | | autofp | Multi threaded ERF file mode. Packets from each flow are assigned to a single detect thread |---------------------------------------------------------------------------------------- | ERF_DAG | autofp | Multi threaded DAG mode. Packets from each flow are assigned to a single detect thread, unlike "dag_auto" where packets from the same flow can be processed by any detect thread | --------------------------------------------------------------------- | | single | Singled threaded DAG mode | --------------------------------------------------------------------- | | workers | Workers DAG mode, each thread does all tasks from acquisition to logging |---------------------------------------------------------------------------------------- | AF_PACKET_DEV | single | Single threaded af-packet mode | --------------------------------------------------------------------- | | workers | Workers af-packet mode, each thread does all tasks from acquisition to logging | --------------------------------------------------------------------- | | autofp | Multi socket AF_PACKET mode. Packets from each flow are assigned to a single detect thread. |---------------------------------------------------------------------------------------- | NETMAP(DISABLED) | single | Single threaded netmap mode | --------------------------------------------------------------------- | | workers | Workers netmap mode, each thread does all tasks from acquisition to logging | --------------------------------------------------------------------- | | autofp | Multi threaded netmap mode. Packets from each flow are assigned to a single detect thread. |---------------------------------------------------------------------------------------- [root@suricata ~]#
Detection-engine部分对规则引擎相关部分的讲解,值得详细的读一下, 可以帮助理解规则组织结构的内部实现.
http://suricata.readthedocs.io/en/latest/configuration/suricata-yaml.html#detection-engine
做一个自定义规则的配置测试:
修改配置文件,增加一个规则文件 my.rules
[root@suricata suricata]# grep -A 1 rule-files suricata.yaml rule-files: - my.rules [root@suricata suricata]# cat rules/my.rules
alert tcp any any -> any 80 (msg: "http test";)
[root@suricata suricata]#
重启suricata之后,做一条http访问, 将能在fast.log中,看见这条规则被命中.
[root@suricata suricata]# tailf /suricata/var/log/suricata/fast.log 02/08/2018-15:48:48.265375 [**] [1:0:0] http test [**] [Classification: (null)] [Priority: 3] {TCP} 192.168.7.8:38274 -> 66.102.251.33:80
至此,基本前期准备已经完成, 接下来就是去读源码了.....
题外: 装个splunk看一下, 结合suricata做分析,看一下.
安装手册: http://docs.splunk.com/Documentation/SplunkLight/7.0.2/Installation/InstallonLinux
说起了很简单,只有三步
To follow these installation instructions, replace splunk_package_name.tgz with the name of the installer package you downloaded. 1. Move the .tgz file to the directory you want to install Splunk Light. For example, to install it into /opt/splunk, use: mv splunk_package_name.tgz /opt/splunk 2. In the installation directory, use the tar command to expand the file. tar xvzf splunk_package_name.tgz 3. Start Splunk Light. splunk start --accept-license
登录: http://suricata:8000
配置也很简单,都是图像化操作, data input设置成 fast.log就好了.
然后,就是酱紫:
我想说, 这不就是个日志分析工具么?
我更喜欢,grep+sed+bash+awk --!!!!