Re: Snort3 configuration issues

Hello Francisco!

All variables must be assigned before including snort_defaults.lua

Example of snort.lua:
-----------------------------------------------------------------------
HOME_NET = "10.10.10.0/24"
EXTERNAL_NET = '[10.0.17.0/24 10.0.14.0/24 192.168.0.0/16]'

conf_dir = os.getenv(‘LUA_PATH’)

if ( not conf_dir ) then
   conf_dir = '.'
end

dofile(conf_dir .. '/snort_defaults.lua')
-----------------------------------------------------------------------

or

-----------------------------------------------------------------------
ips =
{
   id = 1,
   rules = local_rules,
   variables =
   {
       nets =
       {
           HOME_NET = '192.168.1.0/24',
           EXTERNAL_NET = '10.10.10.0/24'
       }
   }
}
-----------------------------------------------------------------------

Thank you, Yehor!

From: Snort-users <[email protected]> on behalf of "Shravan Rangarajuvenkata (shrarang) via Snort-users" <[email protected]>
Reply to: "Shravan Rangarajuvenkata (shrarang)" <[email protected]>
Date: Tuesday, 2 November 2021 at 18:11
To: "[email protected]" <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: [Snort-users] Snort3 configuration issues


CAUTION: This email originated from outside the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.


From: Francisco Godoy Gmail <[email protected]>
Date: Monday, November 1, 2021 at 10:59 AM
To: Shravan Rangarajuvenkata (shrarang) <[email protected]>
Subject: RES: [Snort-openappid] RTMP packets have no "http://"
Hello Shravan
I am trying to install Snort 3 but I saw the error below:

Finished /usr/local/etc/snort/snort.lua:
Loading /usr/local/etc/rules/snort3-community-rules/snort3-community.rules:
ERROR: /usr/local/etc/rules/snort3-community-rules/snort3-community.rules:389 Undefined variable in the string: $SQL_SERVERS.
ERROR: /usr/local/etc/rules/snort3-community-rules/snort3-community.rules:389 undefined variable in the string: $EXTERNAL_NET.
ERROR: /usr/local/etc/rules/snort3-community-rules/snort3-community.rules:1777 Undefined variable in the string: $HOME_NET.
ERROR: /usr/local/etc/rules/snort3-community-rules/snort3-community.rules:1777 undefined variable in the string: $EXTERNAL_NET.
FATAL: /usr/local/etc/rules/snort3-community-rules/snort3-community.rules:1777 ***PortVar Lookup failed on '$HTTP_PORTS'.
Fatal Error, Quitting..

snort.lua configuration:

“-- HOME_NET and EXTERNAL_NET must be set now
-- setup the network addresses you are protecting
HOME_NET = '10.1.5.253/32'

-- set up the external network addresses.
-- (leave as "any" in most situations)

-- EXTERNAL_NET = 'any'
EXTERNAL_NET = '!$HOME_NET'”

Source step by step installation website:
https://kifarunix.com/install-and-configure-snort-3-nids-on-ubuntu-20-04/

Could you  help me ?

thank you very much 😊


De: Snort-openappid <[email protected]> Em nome de Shravan Rangarajuvenkata (shrarang) via Snort-openappid
Enviada em: quinta-feira, 21 de outubro de 2021 12:52
Para: [email protected]
Assunto: [Snort-openappid] RTMP packets have no "http://"

Date: Thu, 12 Aug 2021 16:25:42 +0800 (CST)
From: ?? <[email protected]<mailto:[email protected]>>
To: [email protected]<mailto:[email protected]>
Subject: [Snort-openappid] the rtmp packets have no "http://"
Message-ID: <[email protected]<mailto:[email protected]>>
Content-Type: text/plain; charset="gbk"

static int detector_add_rtmp_url(lua_State* L)
{
..................
 ud->get_odp_ctxt().get_http_matchers().insert_rtmp_url_pattern(pattern);

Why is it here   http ?    the rtmp packets like this :  StreamPlayer/..flashVer...WIN 9,0,47,0..swfUrl...file://..tcUrl..*rtmp://fc432.streamedia.info/Strea.mPlayer/..fpad....audioCodecs

have no http:// xxxxxxxxxx

..................
}

>>> Because RTMP has similar metadata as HTTP, AppId treats RTMP traffic like HTTP for detecting payload applications in it. However, AppId uses separate matchers for RTMP as can be seen in the code:



void HttpPatternMatchers::insert_rtmp_url_pattern(DetectorAppUrlPattern* pattern)

{

    rtmp_url_patterns.emplace_back(pattern);

}

We have a separate Lua detector API for registering RTMP patterns – addRTMPUrl. The patterns registered with this API will not interfere with the HTTP patterns.

This API also allows you to register a path pattern. For example, in odp/lua/payload_group_chivas.lua:
gRTMPPatternList = {
    --ESPN Video
    { 0, 0, 0, 2933, 0, "espn.go.com", "/", "http:", "", 2933},
    --Crackle Video
    { 0, 0, 0, 2955, 0, "crackle.com", "/", "http:", "", 2955},
}

You could replace “http:” with the path pattern you need.

Please let us know if appid detection doesn’t work for your RTMP app after doing the above.

Thanks,
Shravan

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