file_inspect holds blocked files into its memory until snort stops

[Berkay Koyutürk <berkay.koyuturk () labrisnetworks com>]

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.rules

alert ( 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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