Snort mailing list archives
Re: File preprocessor fails to capture files
From: Pablo Cantos Polaino <pcantos () redborder org>
Date: Fri, 8 May 2015 21:29:48 +0200
Exit stats when listening from interface: =============================================================================== Run time for packet processing was 86.342415 seconds Snort processed 247599 packets. Snort ran for 0 days 0 hours 1 minutes 26 seconds Pkts/min: 247599 Pkts/sec: 2879 =============================================================================== Memory usage summary: Total non-mmapped bytes (arena): 10100736 Bytes in mapped regions (hblkhd): 122081280 Total allocated space (uordblks): 8073952 Total free space (fordblks): 2026784 Topmost releasable block (keepcost): 108528 =============================================================================== Packet I/O Totals: Received: 247599 Analyzed: 247599 (100.000%) Dropped: 0 ( 0.000%) Filtered: 0 ( 0.000%) Outstanding: 0 ( 0.000%) Injected: 0 =============================================================================== Breakdown by protocol (includes rebuilt packets): Eth: 247605 (100.000%) VLAN: 0 ( 0.000%) IP4: 247503 ( 99.959%) Frag: 0 ( 0.000%) ICMP: 0 ( 0.000%) UDP: 24 ( 0.010%) TCP: 125325 ( 50.615%) IP6: 0 ( 0.000%) IP6 Ext: 0 ( 0.000%) IP6 Opts: 0 ( 0.000%) Frag6: 0 ( 0.000%) ICMP6: 0 ( 0.000%) UDP6: 0 ( 0.000%) TCP6: 0 ( 0.000%) Teredo: 0 ( 0.000%) ICMP-IP: 0 ( 0.000%) IP4/IP4: 0 ( 0.000%) IP4/IP6: 0 ( 0.000%) IP6/IP4: 0 ( 0.000%) IP6/IP6: 0 ( 0.000%) GRE: 0 ( 0.000%) GRE Eth: 0 ( 0.000%) GRE VLAN: 0 ( 0.000%) GRE IP4: 0 ( 0.000%) GRE IP6: 0 ( 0.000%) GRE IP6 Ext: 0 ( 0.000%) GRE PPTP: 0 ( 0.000%) GRE ARP: 0 ( 0.000%) GRE IPX: 0 ( 0.000%) GRE Loop: 0 ( 0.000%) MPLS: 0 ( 0.000%) ARP: 102 ( 0.041%) IPX: 0 ( 0.000%) Eth Loop: 0 ( 0.000%) Eth Disc: 0 ( 0.000%) IP4 Disc: 122145 ( 49.331%) IP6 Disc: 0 ( 0.000%) TCP Disc: 0 ( 0.000%) UDP Disc: 0 ( 0.000%) ICMP Disc: 0 ( 0.000%) All Discard: 122145 ( 49.331%) Other: 9 ( 0.004%) Bad Chk Sum: 379 ( 0.153%) Bad TTL: 0 ( 0.000%) S5 G 1: 2 ( 0.001%) S5 G 2: 4 ( 0.002%) Total: 247605 =============================================================================== Action Stats: Alerts: 0 ( 0.000%) Logged: 0 ( 0.000%) Passed: 0 ( 0.000%) Limits: Match: 0 Queue: 0 Log: 0 Event: 0 Alert: 0 Verdicts: Allow: 215292 ( 86.952%) Block: 0 ( 0.000%) Replace: 0 ( 0.000%) Whitelist: 32307 ( 13.048%) Blacklist: 0 ( 0.000%) Ignore: 0 ( 0.000%) =============================================================================== Frag3 statistics: Total Fragments: 0 Frags Reassembled: 0 Discards: 0 Memory Faults: 0 Timeouts: 0 Overlaps: 0 Anomalies: 0 Alerts: 0 Drops: 0 FragTrackers Added: 0 FragTrackers Dumped: 0 FragTrackers Auto Freed: 0 Frag Nodes Inserted: 0 Frag Nodes Deleted: 0 =============================================================================== =============================================================================== Stream statistics: Total sessions: 20 TCP sessions: 14 UDP sessions: 6 ICMP sessions: 0 IP sessions: 0 TCP Prunes: 0 UDP Prunes: 0 ICMP Prunes: 0 IP Prunes: 0 TCP StreamTrackers Created: 14 TCP StreamTrackers Deleted: 14 TCP Timeouts: 0 TCP Overlaps: 0 TCP Segments Queued: 6942 TCP Segments Released: 6942 TCP Rebuilt Packets: 6267 TCP Segments Used: 6919 TCP Discards: 48 TCP Gaps: 6459 UDP Sessions Created: 6 UDP Sessions Deleted: 6 UDP Timeouts: 0 UDP Discards: 0 Events: 17 Internal Events: 0 TCP Port Filter Filtered: 0 Inspected: 0 Tracked: 124952 UDP Port Filter Filtered: 0 Inspected: 0 Tracked: 6 =============================================================================== HTTP Inspect - encodings (Note: stream-reassembled packets included): POST methods: 0 GET methods: 0 HTTP Request Headers extracted: 0 HTTP Request Cookies extracted: 0 Post parameters extracted: 0 HTTP response Headers extracted: 2 HTTP Response Cookies extracted: 0 Unicode: 0 Double unicode: 0 Non-ASCII representable: 0 Directory traversals: 0 Extra slashes ("//"): 0 Self-referencing paths ("./"): 0 HTTP Response Gzip packets extracted: 0 Gzip Compressed Data Processed: n/a Gzip Decompressed Data Processed: n/a Total packets processed: 13159 =============================================================================== SMTP Preprocessor Statistics Total sessions : 0 Max concurrent sessions : 0 =============================================================================== dcerpc2 Preprocessor Statistics Total sessions: 0 =============================================================================== SSL Preprocessor: SSL packets decoded: 14 Client Hello: 0 Server Hello: 2 Certificate: 2 Server Done: 3 Client Key Exchange: 0 Server Key Exchange: 0 Change Cipher: 3 Finished: 0 Client Application: 0 Server Application: 1 Alert: 0 Unrecognized records: 9 Completed handshakes: 0 Bad handshakes: 0 Sessions ignored: 1 Detection disabled: 2 =============================================================================== SIP Preprocessor Statistics Total sessions: 0 =============================================================================== File Preprocessor Statistics Total file type callbacks: 0 Total file signature callbacks: 1 Total files would saved to disk: 1 Total files saved to disk: 1 Total file data saved to disk: 446 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 =============================================================================== File type stats: Type Download (Bytes) Upload (Bytes) Total 0 0 0 0 File signature stats: Type Download Upload Undecided file type, continue...( 0) 1 0 Total 1 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: 1 LOG: 0 STOP: 0 BLOCK: 0 REJECT: 0 PENDING: 0 STOP CAPTURE: 0 Total: 1 Total files processed: 2 Total files data processed: 2594891 bytes Total files buffered: 2 Total files released: 1 Total files freed: 1 Total files captured: 1 Total files within one packet: 1 Total buffers allocated: 81 Total buffers freed: 80 Total buffers released: 1 Maximum file buffers used: 80 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: 3196 Number of buffers in use: 0 Number of buffers in free list: 3195 Number of buffers in release list: 1 =============================================================================== Snort exiting ################################################################################### ################################################################################### Exit stats when reading the PCAP file: =============================================================================== Run time for packet processing was 3.962580 seconds Snort processed 3326 packets. Snort ran for 0 days 0 hours 0 minutes 3 seconds Pkts/sec: 1108 =============================================================================== Memory usage summary: Total non-mmapped bytes (arena): 10190848 Bytes in mapped regions (hblkhd): 122081280 Total allocated space (uordblks): 8072912 Total free space (fordblks): 2117936 Topmost releasable block (keepcost): 132992 =============================================================================== Packet I/O Totals: Received: 3326 Analyzed: 3326 (100.000%) Dropped: 0 ( 0.000%) Filtered: 0 ( 0.000%) Outstanding: 0 ( 0.000%) Injected: 0 =============================================================================== Breakdown by protocol (includes rebuilt packets): Eth: 3333 (100.000%) VLAN: 0 ( 0.000%) IP4: 3333 (100.000%) Frag: 0 ( 0.000%) ICMP: 0 ( 0.000%) UDP: 40 ( 1.200%) TCP: 3293 ( 98.800%) IP6: 0 ( 0.000%) IP6 Ext: 0 ( 0.000%) IP6 Opts: 0 ( 0.000%) Frag6: 0 ( 0.000%) ICMP6: 0 ( 0.000%) UDP6: 0 ( 0.000%) TCP6: 0 ( 0.000%) Teredo: 0 ( 0.000%) ICMP-IP: 0 ( 0.000%) IP4/IP4: 0 ( 0.000%) IP4/IP6: 0 ( 0.000%) IP6/IP4: 0 ( 0.000%) IP6/IP6: 0 ( 0.000%) GRE: 0 ( 0.000%) GRE Eth: 0 ( 0.000%) GRE VLAN: 0 ( 0.000%) GRE IP4: 0 ( 0.000%) GRE IP6: 0 ( 0.000%) GRE IP6 Ext: 0 ( 0.000%) GRE PPTP: 0 ( 0.000%) GRE ARP: 0 ( 0.000%) GRE IPX: 0 ( 0.000%) GRE Loop: 0 ( 0.000%) MPLS: 0 ( 0.000%) ARP: 0 ( 0.000%) IPX: 0 ( 0.000%) Eth Loop: 0 ( 0.000%) Eth Disc: 0 ( 0.000%) IP4 Disc: 0 ( 0.000%) IP6 Disc: 0 ( 0.000%) TCP Disc: 0 ( 0.000%) UDP Disc: 0 ( 0.000%) ICMP Disc: 0 ( 0.000%) All Discard: 0 ( 0.000%) Other: 0 ( 0.000%) Bad Chk Sum: 0 ( 0.000%) Bad TTL: 0 ( 0.000%) S5 G 1: 3 ( 0.090%) S5 G 2: 4 ( 0.120%) Total: 3333 =============================================================================== Action Stats: Alerts: 0 ( 0.000%) Logged: 0 ( 0.000%) Passed: 0 ( 0.000%) Limits: Match: 0 Queue: 0 Log: 0 Event: 0 Alert: 0 Verdicts: Allow: 3326 (100.000%) Block: 0 ( 0.000%) Replace: 0 ( 0.000%) Whitelist: 0 ( 0.000%) Blacklist: 0 ( 0.000%) Ignore: 0 ( 0.000%) =============================================================================== Frag3 statistics: Total Fragments: 0 Frags Reassembled: 0 Discards: 0 Memory Faults: 0 Timeouts: 0 Overlaps: 0 Anomalies: 0 Alerts: 0 Drops: 0 FragTrackers Added: 0 FragTrackers Dumped: 0 FragTrackers Auto Freed: 0 Frag Nodes Inserted: 0 Frag Nodes Deleted: 0 =============================================================================== =============================================================================== Stream statistics: Total sessions: 24 TCP sessions: 14 UDP sessions: 10 ICMP sessions: 0 IP sessions: 0 TCP Prunes: 0 UDP Prunes: 0 ICMP Prunes: 0 IP Prunes: 0 TCP StreamTrackers Created: 14 TCP StreamTrackers Deleted: 14 TCP Timeouts: 0 TCP Overlaps: 0 TCP Segments Queued: 1895 TCP Segments Released: 1895 TCP Rebuilt Packets: 1304 TCP Segments Used: 1894 TCP Discards: 0 TCP Gaps: 0 UDP Sessions Created: 10 UDP Sessions Deleted: 10 UDP Timeouts: 0 UDP Discards: 0 Events: 1 Internal Events: 0 TCP Port Filter Filtered: 0 Inspected: 0 Tracked: 3286 UDP Port Filter Filtered: 0 Inspected: 0 Tracked: 10 =============================================================================== HTTP Inspect - encodings (Note: stream-reassembled packets included): POST methods: 0 GET methods: 10 HTTP Request Headers extracted: 10 HTTP Request Cookies extracted: 0 Post parameters extracted: 0 HTTP response Headers extracted: 10 HTTP Response Cookies extracted: 0 Unicode: 0 Double unicode: 0 Non-ASCII representable: 0 Directory traversals: 0 Extra slashes ("//"): 0 Self-referencing paths ("./"): 0 HTTP Response Gzip packets extracted: 0 Gzip Compressed Data Processed: n/a Gzip Decompressed Data Processed: n/a Total packets processed: 2944 =============================================================================== SMTP Preprocessor Statistics Total sessions : 0 Max concurrent sessions : 0 =============================================================================== dcerpc2 Preprocessor Statistics Total sessions: 0 =============================================================================== =============================================================================== SIP Preprocessor Statistics Total sessions: 0 =============================================================================== File Preprocessor Statistics Total file type callbacks: 0 Total file signature callbacks: 10 Total files would saved to disk: 10 Total files saved to disk: 10 Total file data saved to disk: 47473897 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 =============================================================================== File type stats: Type Download (Bytes) Upload (Bytes) Total 0 0 0 0 File signature stats: Type Download Upload Undecided file type, continue...( 0) 10 0 Total 10 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: 10 LOG: 0 STOP: 0 BLOCK: 0 REJECT: 0 PENDING: 0 STOP CAPTURE: 0 Total: 10 Total files processed: 10 Total files data processed: 47473024 bytes Total files buffered: 10 Total files released: 10 Total files freed: 0 Total files captured: 10 Total files within one packet: 4 Total buffers allocated: 1455 Total buffers freed: 0 Total buffers released: 1455 Maximum file buffers used: 787 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: 3196 Number of buffers in use: 0 Number of buffers in free list: 1741 Number of buffers in release list: 1455 =============================================================================== Snort exiting Pablo Cantos redborder.org / pcantos () redborder org 2015-05-08 15:26 GMT+02:00 Hui cao <huica () cisco com>:
What's the exit stats? Best, Hui. On 05/08/2015 08:58 AM, Pablo Cantos Polaino wrote: Thanks for your reply Hui, I'm attaching the full configuration now. I've used a default conf, and included the file preprocessor configuration that I mentioned before. As you can see in the conf file, for normalize preprocessor, there was the following line in the default conf, so I suppose I shouldn't change this: preprocessor normalize_tcp: ips ecn stream About debug, I haven't build snort in debug mode since I haven't be able to go deeper into this. I will try this when I come back to the office, but in any case, I'm interested on use Snort in a normal mode, not in debug mode. I forgot to mention I'm using the last version: 2.9.7.2. Best Regards, Pablo Cantos redborder.org / pcantos () redborder org 2015-05-08 14:40 GMT+02:00 Hui Cao (huica) <huica () cisco com>:What’s the full snort configuration? If you build snort with debug, you should add:config paf_max: 16384 In addition, it would be better to add: preprocessor normalize_tcp: ips <https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0CCQQFjAC&url=http%3A%2F%2Ft73100.security-ids-snort-general.securityupdate.info%2Fpreprocessor-normalize-tcp-ips-t73100.html&ei=B65MVdGDEJObyAT5g4GQBg&usg=AFQjCNEvwb_tSISxggsZbXdfA2SJs7Pm1A&sig2=0_WSEYBph2TfDNTtcatjhw> Best, Hui. From: Pablo Cantos Polaino <pcantos () redborder org> Date: Friday, May 8, 2015 at 8:26 AM To: "snort-users () lists sourceforge net" < snort-users () lists sourceforge net> Subject: [Snort-users] File preprocessor fails to capture files Hello all, I'm doing some tests over the file preprocessor and these are the conf options that I'm using related to file preprocessor: include file_magic.confconfig file:\ file_type_depth 4294967295, \ file_signature_depth 4294967295, \ file_capture_max 4294967295 preprocessor file_inspect:\ capture_queue_size 50000, \ signature, \ capture_disk /var/log/snort/files/ 50000This time what I'm trying to do is to capture every file detected by file preprocessor in the directory /var/log/snort/files. For these tests, I've used the following files: wget ftp://ftp.hp.com/pub/information_storage/software/video/video1.avi wget ftp://ftp.hp.com/pub/information_storage/software/video/MakeUp.mov wget ftp://ftp.hp.com/pub/information_storage/software/video/Fighter.mpg wget http://releases.ubuntu.com/14.04/ubuntu-14.04.2-desktop-amd64.iso wget http://scholar.princeton.edu/sites/default/files/oversize_pdf_test_0.pdf wget https://10.0.70.110/client/VMware-viclient.exe --no-check-certificate wget http://cpansearch.perl.org/src/MIKEM/Device-SNP-1.3/datadesigner/tux-sw.bmp I addition, I've got a pcap traffic capture which includes all the 7 files above. When I run Snort reading this pcap, I got the following: Captured files:# ls -lS-rw------- 1 root root 24211979 May 8 11:148452B621DC334D1FD44470A80540CBEF2F6869AF851B9E8C684EF9402016F692 -rw------- 1 root root 13045613 May 8 11:14 5CF142947C2957EE648457A91B69FB82F088F31205030F9A77B2AD827228C6E9 -rw------- 1 root root 6352738 May 8 11:14 DB57C532919D9ABABAC127F29DBDC05ED832394880E46CAD81A5DDE713CCB4BE -rw------- 1 root root 2936119 May 8 11:14 B4127F43A3F455523B81179CC11AA4F28FC27F4C041D20E28AA08A32D85CB757 -rw------- 1 root root 495316 May 8 11:14 A294AA3D01CD8902BF842D320E7F2C043AF9EAD95D0E7198C3B71A0DBC9D253C -rw------- 1 root root 424526 May 8 11:14 8863DB1EC4B02D5BCC1FB4BD03D220F7458136342CDD47CE507A5B886C6BB56C -rw------- 1 root root 2817 May 8 11:14 D03CDB1F2584A2C06E866931EC5F31F141D9D08F237E04708C7C19D94FFA62F5 -rw------- 1 root root 1958 May 8 11:14 369FDD6FB34BB5E1F0EC79D063FE0115AEF35AA20972BE8E4739417594F692AA -rw------- 1 root root 1958 May 8 11:14 EF49069F43D349C83873A6784351F16ADC39B8358ACFAE3A30EA4DD684C29DCC-rw------- 1 root root 446 May 8 11:148D490C71A27631CF6A476F68C409655CB63BF32C17846A3C3C125A79046DB2C1Downloaded files:# ls -l-rw-r--r-- 1 root root 2187725 May 8 11:01 Fighter.mpg-rw-r--r-- 1 root root 14955972 May 8 11:01 MakeUp.mov-rw-r--r-- 1 root root 375187792 May 8 11:02 VMware-viclient.exe -rw-r--r-- 1 root root 101688487 Jul 10 2014 oversize_pdf_test_0.pdf-rw-r--r-- 1 root root 446 Mar 22 2013 tux-sw.bmp -rw-r--r-- 1 root root 1044381696 Feb 18 20:12ubuntu-14.04.2-desktop-amd64.iso -rw-r--r-- 1 root root 6094376 May 8 11:01 video1.avi # sha256sum *55bdca20aa0ffd8fa3b12029d1e122696a936abc29dd4ec4a5bd878836a5d36fFighter.mpg88a43830b006a4ade60874ffb10a0d5afd06245d0bc460da90015ed73df08d58MakeUp.mov 57bc6123a563056e32fb317c20d1e3b96af723b2b2c9732033e3ab9ce8f8e625 VMware-viclient.exe fa43e683e94372d81210a275cc37112bf2df9c971d377506aab8ae47e5fb0d34 oversize_pdf_test_0.pdf 8d490c71a27631cf6a476f68c409655cb63bf32c17846a3c3c125a79046db2c1 tux-sw.bmp39eeb28bdb8af630850e75e54b9864ca07640a2bb10bd10055763236b99f9b1dubuntu-14.04.2-desktop-amd64.iso bb13418aeb4535c0d1f5c491ad69dd87041a8a1ba7dacc6bc763337beaed7dca video1.aviAs you can see, Snort just captures correctly the smallest file, that fits in a single packet. The others captured files do not coincide with the captured files (in number and size, and hence in sha256) If I run Snort sniffing from my network interface and I download the 7 files by using the wget command, I got the following: Captured files:-rw------- 1 root root 446 May 8 11:308D490C71A27631CF6A476F68C409655CB63BF32C17846A3C3C125A79046DB2C1This case, Snort just captures the smallest file, that fits in a single packet. I've gone deep into the code and I've found out the problem could come from a strange behavior of the Frag3 preprocessor when dealing with packets that contain files. I see two different issues here: 1.- When sniffing from an interface, Snort is only able to capture files which fit in one single packet. 2.- When reading from a network capture file, Snort is able to capture files in general, but it does it in a wrong way when the file take up more than one packet. I'd like to know if you were aware of these strange behaviors. Best Regards, Pablo Cantos redborder.org / pcantos () redborder org
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Current thread:
- File preprocessor fails to capture files Pablo Cantos Polaino (May 08)
- Re: File preprocessor fails to capture files Hui Cao (huica) (May 08)
- Re: File preprocessor fails to capture files Pablo Cantos Polaino (May 08)
- Re: File preprocessor fails to capture files Hui cao (May 08)
- Re: File preprocessor fails to capture files Pablo Cantos Polaino (May 08)
- Re: File preprocessor fails to capture files Hui Cao (huica) (May 08)
- Re: File preprocessor fails to capture files Pablo Cantos Polaino (May 08)
- Re: File preprocessor fails to capture files Hui Cao (huica) (May 08)
- Re: File preprocessor fails to capture files Pablo Cantos Polaino (May 15)
- Re: File preprocessor fails to capture files Russ (May 15)
- Re: File preprocessor fails to capture files Pablo Cantos Polaino (May 16)
- Re: File preprocessor fails to capture files Russ (May 17)
- Re: File preprocessor fails to capture files Pablo Cantos Polaino (May 18)
- Re: File preprocessor fails to capture files Pablo Cantos Polaino (May 08)
- Re: File preprocessor fails to capture files Hui Cao (huica) (May 08)