suricata匹配从入门到精通(四)----编译lua

news2025/1/9 15:08:57

年前有粉丝私信我，想让我做一期lua脚本。作为一个宠粉的博主，那必须给予回应。

suricata结合lua可以达到提升工作效率的作用。

0x00 编译

开启luna 支持：

yum install luarocks （不确定是否有用）

手动下载安装：
（https://redmine.openinfosecfoundation.org/projects/suricata/wiki/Installation_from_GIT_with_luajit

wget http://luajit.org/download/LuaJIT-2.0.5.tar.gztar -zxf LuaJIT-2.0.5.tar.gzcd LuaJIT-2.0.3
make && make install

编译成功的回显：

cd src && install -m 0644 lua.h lualib.h lauxlib.h luaconf.h lua.hpp luajit.h /usr/local/include/luajit-2.0
cd src/jit && install -m 0644 bc.lua v.lua dump.lua dis_x86.lua dis_x64.lua dis_arm.lua dis_ppc.lua dis_mips.lua dis_mipsel.lua bcsave.lua vmdef.lua /usr/local/share/luajit-2.0.5/jit
ln -sf luajit-2.0.5 /usr/local/bin/luajit
==== Successfully installed LuaJIT 2.0.5 to /usr/local ====

cd /home/leeezp/suricata

编译

./configure --prefix=/usr/ --sysconfdir=/etc/ --localstatedir=/var/ --enable-luajit \ --with-libluajit-includes=/usr/local/include/luajit-2.0/ --with-libluajit-libraries=/usr/lib/

make & make install

运行suricata 报错:

./suricata: error while loading shared libraries: libhtp.so.2: cannot open shared object file: No such file or directory

cat /etc/ld.so.conf

echo "/usr/local/lib" >> /etc/ld.so.conf

ldconfig

参考资料：

https://developer.aliyun.com/article/604301

cd /home/leeezp/suricata-6.0.2/src

./suricata --build-info

运行又报错：

/home/leeezp/suricata/rules/test
[root@leezp test]# ../../src/./suricata -r ../ssss.pcap -vvv -k none -c /etc/suricata/suricata.yaml 
30/4/2021 -- 18:08:36 - <Notice> - This is Suricata version 6.0.2 RELEASE running in USER mode
30/4/2021 -- 18:08:36 - <Info> - CPUs/cores online: 1
30/4/2021 -- 18:08:36 - <Config> - luajit states preallocated: 128
/home/leeezp/suricata/src/.libs/lt-suricata: symbol lookup error: /home/leeezp/suricata/src/.libs/lt-suricata: undefined symbol: htp_config_set_lzma_layers

可能是libhtp 库与suricata不匹配；

直接从官网克隆；
git clone https://github.com/OISF/suricata.git
cd suricata
git checkout remotes/origin/master-6.0.x
git clone https://github.com/OISF/libhtp.git
./autogen.sh
cargo install --force cbindgen                  // 开启 rust 支持 (有些协议解析rust写的)
export PATH=$PATH:/root/.cargo/bin/             // 添加 cargo 路径
./configure --prefix=/usr/ --sysconfdir=/etc/ --localstatedir=/var/ --enable-luajit \ --with-libluajit-includes=/usr/local/include/luajit-2.0/ --with-libluajit-libraries=/usr/lib/ 
make
make install

7/5/2021 -- 11:37:51 - <Warning> - [ERRCODE: SC_WARN_PCRE_JITSTACK(326)] - Unable to allocate PCRE JIT stack; will continue without JIT stack

7/5/2021 -- 11:37:51 - <Error> - [ERRCODE: SC_ERR_DETECT_PREPARE(173)] - setting up thread local detect ctx for keyword "pcre" failed

报错可能是因为我之前自己编译过pcre，它使用了我之前自己编译的pcre；

LD_PRELOAD=/lib64/libpcre.so.1 ../../src/./suricata -r ./test.pcap -v -k none -c /etc/suricata/suricata.yaml

suricata]# vim .github/workflows/builds.yml
找到centos7，将里面的 yum -y install 内容复制，依赖库全部更新一遍，应该就好了。

--prefix=/usr/   ： 将Suricata二进制文件安装到/usr/bin/中,默认/usr/local/

只有 /usr/bin 下的suricata 是编译正确的：
LD_PRELOAD=/lib64/libpcre.so.1 /usr/bin/suricata -r /home/leeezp/suricata/rules/test/test.pcap -v -k none  -c /etc/suricata/suricata.yaml

切换版本编译：

git tag -l

git checkout suricata-6.0.1

git checkout .

git status

查看suricata依赖库：

ldd /home/leeezp/suricata

0x01 使用

修改 suricata.yaml 文件，我是在 "outputs:" 节点最下方添加的（注意空格）：

  - lua:
      enabled: yes
      scripts-dir: /home/leeezp/suricata/rules/test
      scripts:
        - script1.lua
        - http.lua
        - test2.lua
        - dns.lua

script1.lua 示例：

function init()
    local needs     = {}
    needs["type"]   = "packet"
    needs["filter"] = "alerts"
    return needs
end

function setup()
    alert_count = 0
end

function log()
    timestring      = SCPacketTimeString()
    sid, rev, gid   = SCRuleIds()
    msg             = SCRuleMsg()
    class, priority = SCRuleClass()

    ip_version, src_ip, dst_ip, protocol, src_port, dst_port = SCPacketTuple()

    if class == nil then
        class = "unknown"
    end

    print (timestring .. "  [**] [" .. gid .. ":" .. sid .. ":" .. rev .. "] " ..
           msg .. " [**] [Classification: " .. class .. "] [Priority: " ..
           priority .. "] {" .. protocol .. "} " ..
           src_ip .. ":" .. src_port .. " -> " .. dst_ip .. ":" .. dst_port)

    alert_count = alert_count + 1;
end

function deinit()
    print ("Alerted " .. alert_count .. " times");
end

运行下试试效果：

是不是一目了然：）