[Bro] HTTP not being seen

Keith Butler kebutler at gmail.com
Fri Sep 13 14:27:29 PDT 2013


In line with Doug's suggestion, can you try a known good source of traffic?  For example a packet trace from Bro Workshop:
The first exercise on the following page has an http.pcap file:
http://www.bro.org/bro-workshop-2011/exercises/logs/index.html

Here is the direct link:
http://www.bro.org/bro-workshop-2011/exercises/logs/http.pcap

Try running:
$ /path/to/your/bro -r http.pcap 

and see what happens?

-kb


On Sep 13, 2013, at 3:50 PM, James Lay <jlay at slave-tothe-box.net> wrote:

> On 2013-09-13 13:31, Liam Randall wrote:
>> Lets enable your capture loss and see what happens:
>> 
>> Add the following to your local.bro; on security onion it will be
>> located at /opt/bro/share/bro/site/
>> 
>> # count the ACKs, tell me the # and % I am missing
>> @load misc/capture-loss.bro
>> 
>> # By default capture-loss reports every 15 minutes, lets turn it up
>> redef CaptureLoss::watch_interval = 1 min;
>> 
>> Give it a couple of minutes and see what the log says under:
>> 
>> /nsm/bro/logs/capture_loss.log
>> 
>> You will see per worker statistics written every minute.
>> 
>> Let us know.
>> 
>> Thanks,
>> 
>> Liam Randall
> 
> 
> Thanks Liam...here's what I got:
> #fields ts      ts_delta        peer    gaps    acks    percent_lost
> #types  time    interval        string  count   count   string
> 2013-09-13T13:34:59-0600        60.000084       bro     0       16      
> 0.000%
> 2013-09-13T13:35:59-0600        60.000044       bro     0       0       
> 0.000%
> 2013-09-13T13:36:59-0600        60.000048       bro     0       14      
> 0.000%
> 2013-09-13T13:37:59-0600        60.000048       bro     1       1       
> 100.000%
> 2013-09-13T13:38:59-0600        60.000038       bro     0       0       
> 0.000%
> 2013-09-13T13:39:59-0600        60.000050       bro     0       0       
> 0.000%
> 2013-09-13T13:40:59-0600        60.000093       bro     0       0       
> 0.000%
> 2013-09-13T13:41:59-0600        60.000023       bro     0       0       
> 0.000%
> 2013-09-13T13:42:59-0600        60.000022       bro     0       0       
> 0.000%
> 2013-09-13T13:43:59-0600        60.000023       bro     0       0       
> 0.000%
> 2013-09-13T13:44:59-0600        60.000089       bro     0       0       
> 0.000%
> 2013-09-13T13:45:59-0600        60.000073       bro     0       0       
> 0.000%
> 2013-09-13T13:46:59-0600        60.000011       bro     0       0       
> 0.000%
> 
> Bro entries:
> 2013-09-13T13:45:33-0600        dPCMEyJBiU7     x.x.x.x    47285   
> 50.18.192.250   80      tcp     -       -       -       -       OTH     
> -       0       C       0       0       0       0       (empty)
> 2013-09-13T13:45:33-0600        PFUbImVSSZ2     x.x.x.x    35306   
> 205.171.2.25    53      udp     63725   www.duckduckgo.com      1       
> C_INTERNET      1       A       0       NOERROR F       F       T       
> T       0       duckduckgo.com,50.18.192.250,50.18.192.251      
> 900.000000,25.000000,25.000000
> 2013-09-13T13:45:34-0600        8ZduhgTSjm6     x.x.x.x    37025   
> 205.171.2.25    53      udp     35309   duckduckgo.com  1       
> C_INTERNET      1       A       0       NOERROR F       F       T       
> T       0       50.18.192.251,50.18.192.250     24.000000,24.000000
> 2013-09-13T13:45:34-0600        dPCMEyJBiU7     x.x.x.x    47285   
> 50.18.192.250   80      active_connection_reuse -       F       bro
> 
> 
> Wget info:
> [13:45:20 gateway:~$] wget www.duckduckgo.com
> --2013-09-13 13:45:33--  http://www.duckduckgo.com/
> Resolving www.duckduckgo.com (www.duckduckgo.com)... 50.18.192.250, 
> 50.18.192.251
> Connecting to www.duckduckgo.com 
> (www.duckduckgo.com)|50.18.192.250|:80... connected.
> HTTP request sent, awaiting response... 301 Moved Permanently
> Location: https://duckduckgo.com/ [following]
> --2013-09-13 13:45:34--  https://duckduckgo.com/
> Resolving duckduckgo.com (duckduckgo.com)... 50.18.192.251, 
> 50.18.192.250
> Connecting to duckduckgo.com (duckduckgo.com)|50.18.192.251|:443... 
> connected.
> HTTP request sent, awaiting response... 200 OK
> Length: 8646 (8.4K) [text/html]
> Saving to: `index.html'
> 
> 100%[=========================>] 8,646       --.-K/s   in 0s
> 
> 2013-09-13 13:45:34 (86.8 MB/s) - `index.html' saved [8646/8646]
> 
> 
> Tshark info:
> 2013-09-13 13:45:33.991079 x.x.x.x -> 50.18.192.250 TCP 76 47285 > 80 
> [SYN] Seq=0 Win=14520 Len=0 MSS=1452 SACK_PERM=1 TSval=147157135 TSecr=0 
> WS=16
> 2013-09-13 13:45:34.035256 50.18.192.250 -> x.x.x.x TCP 76 80 > 47285 
> [SYN, ACK] Seq=0 Ack=1 Win=7240 Len=0 MSS=1460 SACK_PERM=1 
> TSval=23107600 TSecr=147157135 WS=1
> 2013-09-13 13:45:34.035375 x.x.x.x -> 50.18.192.250 TCP 68 47285 > 80 
> [ACK] Seq=1 Ack=1 Win=14528 Len=0 TSval=147157146 TSecr=23107600
> 2013-09-13 13:45:34.035595 x.x.x.x -> 50.18.192.250 HTTP 186 GET / 
> HTTP/1.1
> 2013-09-13 13:45:34.082121 50.18.192.250 -> x.x.x.x TCP 68 80 > 47285 
> [ACK] Seq=1 Ack=119 Win=7122 Len=0 TSval=23107612 TSecr=147157146
> 2013-09-13 13:45:34.082132 50.18.192.250 -> x.x.x.x HTTP 503 HTTP/1.1 
> 301 Moved Permanently  (text/html)
> 2013-09-13 13:45:34.082241 x.x.x.x -> 50.18.192.250 TCP 68 47285 > 80 
> [ACK] Seq=119 Ack=436 Win=15600 Len=0 TSval=147157158 TSecr=23107612
> 2013-09-13 13:45:34.446981 x.x.x.x -> 50.18.192.250 TCP 68 47285 > 80 
> [FIN, ACK] Seq=119 Ack=436 Win=15600 Len=0 TSval=147157249 
> TSecr=23107612
> 2013-09-13 13:45:34.492112 50.18.192.250 -> x.x.x.x TCP 68 80 > 47285 
> [FIN, ACK] Seq=436 Ack=120 Win=7121 Len=0 TSval=23107714 TSecr=147157249
> 2013-09-13 13:45:34.492164 x.x.x.x -> 50.18.192.250 TCP 68 47285 > 80 
> [ACK] Seq=120 Ack=437 Win=15600 Len=0 TSval=147157260 TSecr=23107714
> 
> Not sure what to think...it's very strange.  Thanks again.
> 
> James
> 
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