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208 lines
8.3 KiB
Markdown
在 Ubuntu 15.04 中如何安装和使用 Snort
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对于网络安全而言入侵检测是一件非常重要的事。入侵检测系统(IDS)用于检测网络中非法与恶意的请求。Snort是一款知名的开源的入侵检测系统。其 Web界面(Snorby)可以用于更好地分析警告。Snort使用iptables/pf防火墙来作为入侵检测系统。本篇中,我们会安装并配置一个开源的入侵检测系统snort。
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### Snort 安装 ###
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#### 要求 ####
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snort所使用的数据采集库(DAQ)用于一个调用包捕获库的抽象层。这个在snort上就有。下载过程如下截图所示。
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
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解压并运行./configure、make、make install来安装DAQ。然而,DAQ要求其他的工具,因此,./configure脚本会生成下面的错误。
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flex和bison错误
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
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libpcap错误
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
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因此在安装DAQ之前先安装flex/bison和libcap。
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
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如下所示安装libpcap开发库
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
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安装完必要的工具后,再次运行./configure脚本,将会显示下面的输出。
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
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make和make install 命令的结果如下所示。
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
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
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成功安装DAQ之后,我们现在安装snort。如下图使用wget下载它。
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
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使用下面的命令解压安装包。
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#tar -xvzf snort-2.9.7.3.tar.gz
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
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创建安装目录并在脚本中设置prefix参数。同样也建议启用包性能监控(PPM)的sourcefire标志。
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#mkdir /usr/local/snort
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#./configure --prefix=/usr/local/snort/ --enable-sourcefire
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
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配置脚本会由于缺少libpcre-dev、libdumbnet-dev 和zlib开发库而报错。
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配置脚本由于缺少libpcre库报错。
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
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配置脚本由于缺少dnet(libdumbnet)库而报错。
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
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配置脚本由于缺少zlib库而报错
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
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如下所示,安装所有需要的开发库。
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# aptitude install libpcre3-dev
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
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# aptitude install libdumbnet-dev
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
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# aptitude install zlib1g-dev
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
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安装完snort需要的库之后,再次运行配置脚本就不会报错了。
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运行make和make install命令在/usr/local/snort目录下完成安装。
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#make
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
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#make install
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
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最后,从/usr/local/snort/bin中运行snort。现在它对eth0的所有流量都处在promisc模式(包转储模式)。
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
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如下图所示snort转储流量。
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
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#### Snort的规则和配置 ####
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从源码安装的snort还需要设置规则和配置,因此我们需要复制规则和配置到/etc/snort下面。我们已经创建了单独的bash脚本来用于设置规则和配置。它会设置下面这些snort设置。
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- 在linux中创建用于snort IDS服务的snort用户。
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- 在/etc下面创建snort的配置文件和文件夹。
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- 权限设置并从源代码的etc目录中复制数据。
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- 从snort文件中移除规则中的#(注释符号)。
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-
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#!/bin/bash#
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# snort源代码的路径
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snort_src="/home/test/Downloads/snort-2.9.7.3"
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echo "adding group and user for snort..."
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groupadd snort &> /dev/null
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useradd snort -r -s /sbin/nologin -d /var/log/snort -c snort_idps -g snort &> /dev/null#snort configuration
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echo "Configuring snort..."mkdir -p /etc/snort
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mkdir -p /etc/snort/rules
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touch /etc/snort/rules/black_list.rules
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touch /etc/snort/rules/white_list.rules
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touch /etc/snort/rules/local.rules
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mkdir /etc/snort/preproc_rules
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mkdir /var/log/snort
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mkdir -p /usr/local/lib/snort_dynamicrules
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chmod -R 775 /etc/snort
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chmod -R 775 /var/log/snort
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chmod -R 775 /usr/local/lib/snort_dynamicrules
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chown -R snort:snort /etc/snort
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chown -R snort:snort /var/log/snort
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chown -R snort:snort /usr/local/lib/snort_dynamicrules
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###copy configuration and rules from etc directory under source code of snort
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echo "copying from snort source to /etc/snort ....."
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echo $snort_src
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echo "-------------"
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cp $snort_src/etc/*.conf* /etc/snort
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cp $snort_src/etc/*.map /etc/snort##enable rules
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sed -i 's/include \$RULE\_PATH/#include \$RULE\_PATH/' /etc/snort/snort.conf
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echo "---DONE---"
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改变脚本中的snort源目录路径并运行。下面是成功的输出。
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
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上面的脚本从snort源中复制下面的文件和文件夹到/etc/snort配置文件中
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
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snort的配置非常复杂,要让IDS能正常工作需要进行下面必要的修改。
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ipvar HOME_NET 192.168.1.0/24 # LAN side
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----------
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ipvar EXTERNAL_NET !$HOME_NET # WAN side
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
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var RULE_PATH /etc/snort/rules # snort signature path
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var SO_RULE_PATH /etc/snort/so_rules #rules in shared libraries
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var PREPROC_RULE_PATH /etc/snort/preproc_rules # Preproces path
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var WHITE_LIST_PATH /etc/snort/rules # dont scan
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var BLACK_LIST_PATH /etc/snort/rules # Must scan
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
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include $RULE_PATH/local.rules # file for custom rules
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移除ftp.rules、exploit.rules前面的注释符号(#)。
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
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现在[下载社区规则][1]并解压到/etc/snort/rules。启用snort.conf中的社区及紧急威胁规则。
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
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
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进行了上面的更改后,运行下面的命令来检验配置文件。
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#snort -T -c /etc/snort/snort.conf
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
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### 总结 ###
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本篇中,我们关注了开源IDPS系统snort在Ubuntu上的安装和配置。通常它用于监控事件,然而它可以被配置成用于网络保护的在线模式。snort规则可以在离线模式中可以使用pcap捕获文件进行测试和分析
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--------------------------------------------------------------------------------
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via: http://linoxide.com/security/install-snort-usage-ubuntu-15-04/
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作者:[nido][a]
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译者:[geekpi](https://github.com/geekpi)
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校对:[wxy](https://github.com/wxy)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译,[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://linoxide.com/author/naveeda/
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[1]:https://www.snort.org/downloads/community/community-rules.tar.gz
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