Analyze Data packet with PythonScript with Lua Rules

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Hello, I am new in suricata IDPS(and lua).

Suricata Build Info

This is Suricata version 7.0.0 RELEASE
Features: NFQ PCAP_SET_BUFF AF_PACKET HAVE_PACKET_FANOUT LIBCAP_NG LIBNET1.1 HAVE_HTP_URI_NORMALIZE_HOOK PCRE_JIT HAVE_NSS HTTP2_DECOMPRESSION HAVE_LUA HAVE_LUAJIT HAVE_LIBJANSSON TLS TLS_C11 MAGIC RUST 
SIMD support: none
Atomic intrinsics: 1 2 4 8 byte(s)
64-bits, Little-endian architecture
GCC version 11.3.0, C version 201112
compiled with _FORTIFY_SOURCE=2
L1 cache line size (CLS)=64
thread local storage method: _Thread_local
compiled with LibHTP v0.5.45, linked against LibHTP v0.5.45

Suricata Configuration:
  AF_PACKET support:                       yes
  AF_XDP support:                          no
  DPDK support:                            no
  eBPF support:                            no
  XDP support:                             no
  PF_RING support:                         no
  NFQueue support:                         yes
  NFLOG support:                           no
  IPFW support:                            no
  Netmap support:                          no 
  DAG enabled:                             no
  Napatech enabled:                        no
  WinDivert enabled:                       no

  Unix socket enabled:                     yes
  Detection enabled:                       yes

  Libmagic support:                        yes
  libjansson support:                      yes
  hiredis support:                         yes
  hiredis async with libevent:             yes
  PCRE jit:                                yes
  LUA support:                             yes, through luajit
  libluajit:                               yes
  GeoIP2 support:                          yes
  Non-bundled htp:                         yes
  Hyperscan support:                       yes
  Libnet support:                          yes
  liblz4 support:                          yes
  Landlock support:                        yes

  Rust support:                            yes
  Rust strict mode:                        no
  Rust compiler path:                      /usr/bin/rustc
  Rust compiler version:                   rustc 1.66.1 (90743e729 2023-01-10) (built from a source tarball)
  Cargo path:                              /usr/bin/cargo
  Cargo version:                           cargo 1.66.1

  Python support:                          yes
  Python path:                             /usr/bin/python3
  Install suricatactl:                     yes
  Install suricatasc:                      yes
  Install suricata-update:                 yes

  Profiling enabled:                       no
  Profiling locks enabled:                 no
  Profiling rules enabled:                 no

  Plugin support (experimental):           yes
  DPDK Bond PMD:                           no

Development settings:
  Coccinelle / spatch:                     no
  Unit tests enabled:                      no
  Debug output enabled:                    no
  Debug validation enabled:                no
  Fuzz targets enabled:                    no

Generic build parameters:
  Installation prefix:                     /usr
  Configuration directory:                 /etc/suricata/
  Log directory:                           /var/log/suricata/

  --prefix                                 /usr
  --sysconfdir                             /etc
  --localstatedir                          /var
  --datarootdir                            /usr/share

  Host:                                    x86_64-pc-linux-gnu
  Compiler:                                gcc (exec name) / g++ (real)
  GCC Protect enabled:                     yes
  GCC march native enabled:                no
  GCC Profile enabled:                     no
  Position Independent Executable enabled: yes
  CFLAGS                                   -g -O2 -ffile-prefix-map=/build/suricata-L8uOzB/suricata-7.0.0=. -flto=auto -ffat-lto-objects -flto=auto -ffat-lto-objects -fstack-protector-strong -Wformat -Werror=format-security -fPIC -std=c11 -I${srcdir}/../rust/gen -I${srcdir}/../rust/dist
  PCAP_CFLAGS                               -I/usr/include
  SECCFLAGS                                -fstack-protector -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security

https://docs.suricata.io/en/latest/rules/lua-detection.html
https://docs.suricata.io/en/latest/lua/lua-functions.html

I am trying to some kind of hook to communicate with my python script. In my python script, it will return 1 after analyzing data packet if data packet needs to drop. 0 Otherwise.

So, I have created a lua file in /etc/suricata/rules/py_hook.lua with below content:

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

function match(args)
    local python_script = "python3 /home/user/nidps/analyze_packet.py"
    local output = os.execute(python_script .. " " .. args["packet"].tostring())
    if output == "1" then
      return 1
    end
    return 0
end

To run this rules, I am running Suricata with following command “suricata -i eth0 -s /etc/suricata/rules/py_hook.lua”

But suricata will saying there is some error in my lua file.

Please help me to solve this issue

Thanks in advanced

2

Please share the actual error.

Also keep in mind that performance will be awful. Using Lua has quite a performance impact, but calling out to python from Lua will be much worse.