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file_inspect holds blocked files into its memory until snort stops
From: Berkay Koyutürk <berkay.koyuturk () labrisnetworks com>
Date: Thu, 7 Sep 2017 08:56:27 +0300
Hi everybody,As title says above I have a problem with file_inspect preprocessor. I am running snort with inline mod with file configurations below:
#file config config file: \ file_type_depth 0, \ file_signature_depth 0, \ file_capture_memcap 1000, \ file_capture_max 4294967295, \ file_block_timeout 1, \ file_capture_min 0 #file_inspect preprocessor preprocessor file_inspect: \ signature, \ capture_disk /root/captured_files 1024, \ capture_queue_size 5000, \ blacklist sha_blacklist, \ greylist sha_greylist #file_inspect.rulesalert ( msg: “File signature “; sid: 1; gid: 147; rev: 1; metadata: rule-type preproc; )
With these configurations I can successfully block downloading files if its sha256 sum is in sha_blacklist file. My problem is , while snort running it keeps holding this files on its memory and after a while for example 33 files with 10MB each, it stops blocking files even cant see them anymore. My snort exit stats is below:
====================================== Total file type callbacks: 0 Total file signature callbacks: 33 Total files would saved to disk: 33 Total files saved to disk: 0 Total file data saved to disk: 0 bytes Total files duplicated: 33 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 ======================================== File type stats: Type Download (Bytes) Upload (Bytes) Total 0 0 0 0 File signature stats: Type Download Upload Undecided file type, continue...( 0) 33 0 Total 33 0 File type verdicts: UNKNOWN: 0 LOG: 0 STOP: 0 BLOCK: 0 REJECT: 0 PENDING: 0 STOP CAPTURE: 0 Total: 0 File signature verdicts: UNKNOWN: 0 LOG: 0 STOP: 0 BLOCK: 33 REJECT: 0 PENDING: 0 STOP CAPTURE: 0 Total: 33 Total files processed: 33 Total files data processed: 346030080 bytes Total files buffered: 33 Total files released: 33 Total files freed: 0 Total files captured: 33 Total files within one packet: 0 Total buffers allocated: 10560 Total buffers freed: 0 Total buffers released: 10560 Maximum file buffers used: 379 Total buffers free errors: 0 Total buffers release errors: 0 Total memcap failures: 0 Total memcap failures at reserve: 0 Total reserve failures: 0 Total file capture size min: 0 Total file capture size max: 0 Total capture max before reserve: 0 Total file signature max: 0 Maximum buffers can allocate: 31976 Number of buffers in use: 0 Number of buffers in free list: 21416 Number of buffers in release list: 10560 ====================================With this stat above I downloaded 52 files and first 36 are blocked but after that snort didn't even see them .I am using snort version 2.9.8.2 with daq inline mod. Am I forgetting some sort of configuration or is it a bug? Thanks for help
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Current thread:
- file_inspect holds blocked files into its memory until snort stops Berkay Koyutürk (Sep 06)
- Re: file_inspect holds blocked files into its memory until snort stops Joel Esler (jesler) via Snort-users (Sep 07)
- Re: file_inspect holds blocked files into its memory until snort stops Berkay Koyutürk (Sep 11)
- Re: file_inspect holds blocked files into its memory until snort stops Berkay Koyutürk (Sep 25)
- Re: file_inspect holds blocked files into its memory until snort stops Al Lewis (allewi) via Snort-users (Sep 25)
- Re: file_inspect holds blocked files into its memory until snort stops Berkay Koyutürk (Sep 27)
- Re: file_inspect holds blocked files into its memory until snort stops Russ via Snort-users (Sep 27)
- Re: file_inspect holds blocked files into its memory until snort stops Berkay Koyutürk (Sep 27)
- Re: file_inspect holds blocked files into its memory until snort stops Berkay Koyutürk (Sep 11)
- Re: file_inspect holds blocked files into its memory until snort stops Joel Esler (jesler) via Snort-users (Sep 07)