基于Bro的应用层数据包识别工具 - FreeBuf网络安全行业门户

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基于Bro的应用层数据包识别工具

2018-08-13 15:00:20

拓扑介绍

应用识别系统将会通过bro识别应用并生成日志。ELK部署在远程端，用于收集，分析，存储和识别所有日志。BRO安装在IP为192.168.1.147的机器上，ELK安装在IP为192.168.1.142的机器上。

ens33              网络接口名称   
192.168.1.147      bro设备的网络接口ipv4地址    
192.168.1.142      ELK设备的网络接口ipv4地址

安装bro

由于metron-bro-plugin-kafka插件的编译安装依赖于bro源代码，因此我们使用bro源代码进行安装。

依赖安装

~/src$ sudo apt-get install -y tcpdump git vim cmake make gcc g++ flex bison libpcap-dev python-dev swig zlib1g-dev libssl1.0-dev dirmngr curl openjdk-8-jre zookeeperd

下载bro源代码并验证

~/src$ wget https://www.bro.org/downloads/bro-2.5.4.tar.gz 
~/src$ wget https://www.bro.org/downloads/bro-2.5.4.tar.gz.asc 
~/src$ gpg --recv-keys C68B494DF56ACC7E
~/src$ gpg -v bro-2.5.4.tar.gz.asc

安装

~/src$ tar -xvf bro-2.5.4.tar.gz 
~/src$ cd bro-2.5.4/ 
~/src/bro-2.5.4$ ./configure --enable-debug 
~/src/bro-2.5.4$ make 
~/src/bro-2.5.4$ sudo make install

设置env值

Bro安装的目录位置为/usr/local/bro/bin/，添加以下行至/etc/bash.bashrc文件中：

if [ -d /usr/local/bro/bin ];then
  PATH="/usr/local/bro/bin/:$PATH"
  export PATH
fi

将bro设置为systemd并启动bro服务

~# cat > /etc/systemd/system/bro.service << EOL
[Unit]
Description=Bro
After=network.target

[Service]
ExecStartPre=/usr/local/bro/bin/broctl cleanup
ExecStartPre=/usr/local/bro/bin/broctl check
ExecStartPre=/usr/local/bro/bin/broctl install
ExecStart=/usr/local/bro/bin/broctl start
ExecStop=/usr/local/bro/bin/broctl stop
RestartSec=10s
Type=oneshot
RemainAfterExit=yes
TimeoutStopSec=600

[Install]
WantedBy=multi-user.target

EOL

~# systemctl daemon-reload   
~# systemctl enable bro  
~# systemctl start bro

有关bro的详细安装和使用，请参阅文档how-to-deploy-bro-app-identification-env.mkd。

将本地解析配置文件添加到BRO

以下我将通过一个示例来说明，本地Bro解析配置文件为bro_parse_jd.bro。

在/usr/local/bro/share/bro/site路径下创建一个名为harbian的目录，并将bro_parse_jd.bro文件放置在该目录中。然后在harbian目录中创建一个名为__load__.bro的文件，并在 __load__.bro文件中添加以下行：

@load ./bro_parse_jd.bro.

__load__.bro文件仅用于在启动bro时自动加载当前目录中的bro配置文件。此外，我们还需要将以下行添加到文件/usr/local/bro/share/bro/site/local.bro中：

@load ./harbian

然后使用以下命令重启bro服务：

~# systemctl restart bro

安装Kafka

下载kafka源

~/src$ wget https://archive.apache.org/dist/kafka/1.0.0/kafka_2.12-1.0.0.tgz 
~/src$ wget https://archive.apache.org/dist/kafka/1.0.0/kafka_2.12-1.0.0.tgz.asc

验证

~/src$ gpg --recv-keys  3B417B9B 
~/src$ gpg -v kafka_2.12-1.0.0.tgz.asc

安装kafka并启动服务

~/src$ tar -xvf kafka_2.12-1.0.0.tgz
~/src$ sudo mv kafka_2.12-1.0.0 /opt/kafka
~/src$ sudo sed -i '/^log.dirs/{s/=.*//;}' /opt/kafka/config/server.properties
~/src$ sudo sed -i 's/^log.dirs/log.dirs=\/var\/lib\/kafka/' /opt/kafka/config/server.properties
~/src$ sudo sed -i '$alisteners=bro://192.168.1.147:9092' /opt/kafka/config/server.properties 

~/src# cat > /etc/systemd/system/kafka.service << EOF
[Unit]
Description=Kafka Service
Wants=network.target
After=network.target

[Service]
ExecStart=/opt/kafka/bin/kafka-server-start.sh /opt/kafka/config/server.properties
ExecReload=on-failure
Restart=always
User=root
Group=root
StandardOutput=syslog
StandardError=syslog

[Install]
WantedBy=multi-user.target
EOF

启用kafka服务并启动

启动kafka服务时，必须确保zookeeper服务已启动。

~/src$ systemctl enable zookeeper 
~/src$ systemctl start zookeeper
~/src$ sudo systemctl daemon-reload
~/src$ sudo systemctl enable kafka 
~/src$ sudo systemctl start kafka

安装metron-bro-plugin-kafka插件

安装librdkafka

~/src$ curl -L https://github.com/edenhill/librdkafka/archive/v0.9.4.tar.gz | tar xvz 
~/src$ cd librdkafka-0.9.4/ 
~/src/librdkafka-0.9.4$ ./configure --enable-sasl 
~/src/librdkafka-0.9.4$ make 
~/src/librdkafka-0.9.4$ sudo make install

安装插件

~/src$ git clone https://github.com/apache/metron-bro-plugin-kafka.git
~/src$ cd metron-bro-plugin-kafka
~/src/metron-bro-plugin-kafka$ ./configure --bro-dist=$HOME/src/bro-2.5.4/
~/src/metron-bro-plugin-kafka$ make 
~/src/metron-bro-plugin-kafka$ sudo make install

确认插件是否已被正确安装：

~/src# bro -N Apache::Kafka

如何设置bro日志写入到kafka

设置以下行到/usr/local/bro/share/bro/site/local.bro文件中：

@load /usr/local/bro/lib/bro/plugins/APACHE_KAFKA/scripts/Apache/Kafka/logs-to-kafka.bro
redef Kafka::topic_name = "";
redef Kafka::logs_to_send = set(Conn::LOG, HTTP::LOG, DNS::LOG, SMTP::LOG, SSL::LOG, Software::LOG, DHCP::LOG, FTP::LOG, IRC::LOG, Notice::LOG, X509::LOG, SSH::LOG, SNMP::LOG);
redef Kafka::kafka_conf = table(["metadata.broker.list"] = "192.168.1.147:9092");

确保bro日志已被写入到kafka中：

~/src# systemctl status kafka | grep "Active:.active"
   Active: active (running) since Tue 2018-07-24 03:25:10 CST; 23min ago

~/src# netstat -ntpl  | grep 9092
tcp6       0      0 192.168.1.147:9092      :::*                    LISTEN      30913/java 

~/src$ ls /var/lib/kafka/bro-0/00000000000000000000.log

安装ELK

依赖安装

~$ sudo apt-get install -y openjdk-8-jre curl wget libgeoip-dev

下载ELK deb包以及SHA512 (512-bit) checksums文件

~$ mkdir src; cd src 
~/src$ wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.3.0.deb 
~/src$ wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.3.0.deb.sha512 
~/src$ wget https://artifacts.elastic.co/downloads/logstash/logstash-6.3.0.deb 
~/src$ wget https://artifacts.elastic.co/downloads/logstash/logstash-6.3.0.deb.sha512 
~/src$ wget https://artifacts.elastic.co/downloads/kibana/kibana-6.3.0-amd64.deb 
~/src$ wget https://artifacts.elastic.co/downloads/kibana/kibana-6.3.0-amd64.deb.sha512

验证ELK deb包

~/src$ sha512sum -c elasticsearch-6.3.0.deb.sha512  
elasticsearch-6.3.0.deb: OK
~/src$ sha512sum -c logstash-6.3.0.deb.sha512 
logstash-6.3.0.deb: OK
~/src$ sha512sum -c kibana-6.3.0-amd64.deb.sha512 
kibana-6.3.0-amd64.deb: OK

安装ELK deb包

~/src$ sudo dpkg -i *.deb

Logstash配置

~/src$ echo config.reload.automatic: true |sudo tee -a /etc/logstash/logstash.yml
~/src$ echo config.reload.interval: 3s |sudo tee -a /etc/logstash/logstash.yml

创建新的logstash配置

为每种类型的日志生成conf文件。以下仅是软件的一个示例：

~/src# cat > /etc/logstash/conf.d/bro-software.conf << EOF 
input {
  kafka {
    topics => ["software"]
    group_id => "bro_logstash"
     		bootstrap_servers => "192.168.1.147:9092"
     		codec => json
     		auto_offset_reset => "earliest"
   	}
}

output {
  elasticsearch {
     		hosts => ["192.168.1.142:9200"]
    index => "bro-software"
    document_type => "software"
   	}
}

其他conf文件你可以在logstash-conf中找到。将这些配置文件放置在/etc/logstash/conf.d目录中。

Elasticsearch配置

将Elasticsearch绑定到localhost

将以下行添加到/etc/elasticsearch/elasticsearch.yml；

network.host: "192.168.1.142" 
http.port:9200

如果elasticsearch服务为远程端，请将绑定地址设置为指定的IP地址。

确保elasticsearch正常工作

sudo systemctl start elasticsearch 
curl http://192.168.1.142:9200
{
  "name" : "VZDjFmY",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "xql3xQSbSvinXDIYchwswQ",
  "version" : {
    "number" : "6.3.0",
    "build_flavor" : "default",
    "build_type" : "deb",
    "build_hash" : "424e937",
    "build_date" : "2018-06-11T23:38:03.357887Z",
    "build_snapshot" : false,
    "lucene_version" : "7.3.1",
    "minimum_wire_compatibility_version" : "5.6.0",
    "minimum_index_compatibility_version" : "5.0.0"
  },
  "tagline" : "You Know, for Search"
}

Kibana配置

在Kibana配置文件/etc/kibana/kibana.yml中添加以下行：

server.port: 5601
server.host: "192.168.1.142"
elasticsearch.url: "http://192.168.1.142:9200"

启动ELK服务

~/src$ sudo /bin/systemctl daemon-reload
~/src$ sudo /bin/systemctl enable elasticsearch.service logstash.service kibana.service
~/src$ sudo systemctl start elasticsearch.service kibana.service logstash.service

Kibana

打开Kibana

在浏览器地址栏中输入192.168.1.142:5601。打开如下所示页面：

基于Bro的应用层数据包识别工具

创建索引模式

以下是使用软件日志创建模式的示例：

基于Bro的应用层数据包识别工具

发现软件索引模式

创建可视化

参考

https://www.bro.orghttp://try.bro.org/
https://www.bro.org/sphinx/scripts/base/frameworks/software/main.bro.html
https://www.bro.org/sphinx/scripts/base/bif/plugins/Bro_HTTP.events.bif.bro.html
https://www.bro.org/sphinx/scripts/base/bif/plugins/Bro_SSL.events.bif.bro.html
https://www.elastic.co/guide/en/logstash/current/plugins-inputs-kafka.html
https://www.elastic.co/guide/en/logstash/6.3/plugins-outputs-elasticsearch.html
https://www.elastic.co/https://github.com/apache/metron-bro-plugin-kafka

*参考来源：github，FB小编 secist 编译，转载请注明来自FreeBuf.COM

# Bro # 数据识别

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