[Snort-users] preprocessor file_inspect does not capture file

Lương Minh Tuấn not.soledad at ...11827...
Wed Dec 2 06:03:40 EST 2015


     Thank snort team a thousand thousand tons, option '-k none' makes 
snort works like a charm


On 12/2/2015 5:10 PM, Y M wrote:
> Hmm..just for testing purposes, calculate the sha256 hashes of the 
> files, and add the hashes to the black list, and then re-run Snort.
>
> Another thing to try is to use "-k none" when running Snort to read 
> the pcap.
>
> YM
>
> Sent from Mobile
>
> _____________________________
> From: Lương Minh Tuấn <not.soledad at ...11827... 
> <mailto:not.soledad at ...11827...>>
> Sent: Wednesday, December 2, 2015 1:05 PM
> Subject: Re: [Snort-users] preprocessor file_inspect does not capture file
> To: Y M <snort at ...15979... <mailto:snort at ...15979...>>
> Cc: <snort-users at lists.sourceforge.net 
> <mailto:snort-users at lists.sourceforge.net>>
>
>
>
>     I tried many times, add, remove every options: type_id, signature 
> to test if preprocessor can detect something but no luck, nothing in 
> snort exit stat.
>     The nearest test result with type_id, signature on:
>     - configuration I tried:
>     exactly like document:
>
> /preprocessor file_inspect: type_id, signature, \/ /
> //                capture_disk /home/file_capture/tmp/, \/ /
> //                capture_queue_size 5000/
>
>     - snort say that file_inspect maybe good:
> /File config:/ /
> //    file type: ENABLED/ /
> //    file signature: ENABLED/ /
> //    file capture: ENABLED/ /
> //    file capture directory: /home/file_capture/tmp// /
> //    file capture disk size: 300 (Default) megabytes/ /
> //    file sent to host: DISABLED (Default), port number: 0/ /
> //
> //    File service: file type enabled./ /
> //    File service: file signature enabled./ /
> //    File service: file capture enabled./ /
> //    File capture thread started tid=0x7f5add080700 (pid=20478)/
>
>     - After uploading, downloading a pdf, a pcap, and a zip file, exit 
> stats are:
> /   File Preprocessor Statistics/ /
> //  Total file type callbacks:            0/ /
> //  Total file signature callbacks:       0/ /
> //  Total files would saved to disk:      0/ /
> //  Total files saved to disk:            0/ /
> //  Total file data saved to disk:        0         bytes/ /
> //  Total files duplicated:               0/ /
> //  Total files reserving failed:         0/ /
> //  Total file capture min:               0/ /
> //  Total file capture max:               0/ /
> //  Total file capture memcap:            0/ /
> //  Total files reading failed:           0/ /
> //  Total file agent memcap failures:     0/ /
> //  Total files sent:                     0/ /
> //  Total file data sent:                 0/ /
> //  Total file transfer failures:         0/ /
> //===============================================================================/ 
> /
> //Files processed: none/ /
> //===============================================================================/ 
>
>
> Thanks
> On 12/2/2015 4:26 PM, Y M wrote:
>
>     Do you have file type and file signature enabled? For instance, I
>     don't see the type_id in the preprocessor configurations you posted.
>
>     Documentation says that capturing depends on type and signature
>     being enabled, I.e: Unknown file types will not be captured.
>
>     YM
>
>     Sent from Mobile
>
>     _____________________________
>     From: Lương Minh Tuấn < not.soledad at ...11827...
>     <mailto:not.soledad at ...11827...>>
>     Sent: Wednesday, December 2, 2015 11:09 AM
>     Subject: Re: [Snort-users] preprocessor file_inspect does not
>     capture file
>     To: Y M < snort at ...15979... <mailto:snort at ...15979...>>
>     Cc: < snort-users at lists.sourceforge.net
>     <mailto:snort-users at lists.sourceforge.net>>
>
>
>     Hi YM,
>         file_captrue_min and file_capture_max is set with default
>     value, 0 and 1GB. the path in capture_disk exist with full
>     permission (I set to 777 for testing). README.file says that with
>     block of config which I posted, snort can capture any file, but in
>     my case, it does not work.
>          I tried using signature in file_magic.conf to write a normal
>     rule, snort detect ok, and with keyword tag, i can even capture
>     all file in tcpdump.
>
>
>
>     On 12/2/2015 2:16 PM, Y M wrote:
>
>         I haven't played enough with the file_inspect preprocessor but
>         what is the size of the file in relation to things like
>         "file_capture_min", "file_capture_max"?
>
>         Also, does the path in "capture_disk" exist?
>
>         Finally, as far as I understand, only those files that have
>         their hashes in the black or grey lists will be captured.
>         Please anyone, correct me if I am wrong.
>
>         YM
>
>         Sent from Mobile
>
>         _____________________________
>         From: Lương Minh Tuấn < not.soledad at ...11827...
>         <mailto:not.soledad at ...11827...>>
>         Sent: Wednesday, December 2, 2015 9:46 AM
>         Subject: [Snort-users] preprocessor file_inspect does not
>         capture file
>         To: < snort-users at lists.sourceforge.net
>         <mailto:snort-users at lists.sourceforge.net>>
>
>
>         Hi everybody,
>         I had problem when using file_inspect to capture file send over
>         FTP. Please help me resolv. Here's my Snort info:
>         - Server OS:
>         $cat /etc/redhat-release
>         CentOS Linux release 7.1.1503 (Core)
>         - Snort version: 2.9.7.6, build options: --enable-file-inspect
>         --enable-open-appid --enable-sourcefire
>         - configuration file:
>         exactly from snortrules-snapshot-2976.tar.gz, add file_inspect
>         config as discuss in README.file:
>         include file_magic.conf
>         preprocessor file_inspect: signature, \
>         capture_queue_size 5000, \
>         capture_disk /home/file_capture/tmp/
>
>         Snort does not detect or process any file, here's my exit stat:
>         File Preprocessor Statistics
>         Total file type callbacks: 0
>         Total file signature callbacks: 0
>         Total files would saved to disk: 0
>         Total files saved to disk: 0
>         Total file data saved to disk: 0 bytes
>         Total files duplicated: 0
>         Total files reserving failed: 0
>         Total file capture min: 0
>         Total file capture max: 0
>         Total file capture memcap: 0
>         Total files reading failed: 0
>         Total file agent memcap failures: 0
>         Total files sent: 0
>         Total file data sent: 0
>         Total file transfer failures: 0
>         ===============================================================================
>
>         Files processed: none
>
>         I tried to build snort v2.9.7.0, 2.9.6.2 and latest 2.9.8.0
>         but no
>         luck. Please help me!
>
>         Thanks and best regards!
>         -- 
>         Lương Minh Tuấn
>         Email: not.soledad at ...11827... <mailto:not.soledad at ...11827...>
>         Skype: minhtuan208
>
>
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