[Snort-devel] File-inspect test automation framework and related issues

Hui Cao (huica) huica at ...3461...
Mon Jan 25 10:50:08 EST 2016


Hi Vladimir,

Do you have the following configuration in you conf? FTP for file inspection requires this is on


preprocessor normalize_tcp: ips


Best,

Hui.

From: "Russ Combs (rucombs)" <rucombs at ...3461...<mailto:rucombs at ...3461...>>
Date: Monday, January 25, 2016 at 10:39 AM
To: Vladimir Kunschikov <kunschikov at ...2499...<mailto:kunschikov at ...2499...>>, "snort-devel at lists.sourceforge.net<mailto:snort-devel at ...362....net>" <snort-devel at lists.sourceforge.net<mailto:snort-devel at ...2763...rge.net>>
Subject: Re: [Snort-devel] File-inspect test automation framework and related issues

Hi - thanks for sharing this tool.  We have something that we use internally but this is worth trying out.

I will forward this to bugs to address the ftp issue you mention.  You may find some interest on snort-users too.

Russ

On 1/20/16 3:54 PM, Vladimir Kunschikov wrote:
 Hello All,
 has anyone thought about automation of the Snort file-inspect tests?

I want to introduce such test framework for the file capture functionality of the Snort. I hope it will be useful in error detection in further extension of the file-inspect preprocessor. This framework checks equality of the files being captured from traffic to the original files which were actually transferred.

It is available at

 https://github.com/kunschikov/snort.robot.git/

I am using this framework for quite a period.
This tests have discovered that the overall level of file capturing is surprisingly good; but there exist some number of  issues in many protocols,  especially in the SMB protocol support.  I haven't got positive SMB test yet. But other protocols have some issues too.

 One of this issues was fixed in the 2.9.8.0 release: the HTTP parser strictness while reading HTTP answers from ms proxy server: there were trailing spaces after content-length.

Another issue is not fixed yet, and I've added test for it: it is a 'ftp mp3' test. In this test I am trying to capture file.mp3 file transfer. Its being captured with error: saved file it has different sha checksum to the original one.  This issue can be fixed in src/dynamic-preprocessors/ftptelnet/snort_ftptelnet.c void SnortFTPData_EOF() function by disabling last flush stream and data processing. So it should look like

void SnortFTPData_EOF(SFSnortPacket *p)
{
...
    initFilePosition(&data_ssn->position, _dpd.fileAPI->get_file_processed_size(p->stream_session));
    finalFilePosition(&data_ssn->position);
}


I am going to add some SMB samples to this framework.

Addition of the new tests is quite easy: you should put file which was transferred to the 'files' folder and corresponding pcap to the 'pcaps'  and then add line to the file_inspect.robot.  For example, if you are checking `1.txt` transmission through `HTTP` channel which was captured as 1.pcap you should simply add line
  Text sample    pcap/http/1.pcap      1.txt
to the file_inspect.robot configuration file.

Hope this framework will be useful to the community. Just set ${SNORT} and ${SNORTOPT} according to your snort setup and enjoy it.
Let all tests be green.



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