zeek June 2005

zeek@lists.zeek.org

20 participants
43 discussions

by Mike Muratet

Greetings I am integrating bro into a larger system so that I can use it to keep track of connections (which seems easier than trying to write a method from scratch with pcap). I thought it would be straightforward to grep for print or email or alarm statements to figure out where to put the hooks for an IPC message but so far it eludes me. Is there a principal module for outputting the notifications? Thanks Mike

13 years, 8 months

[Bro] Empty reports!!

by Angelita de Cássia Corrêa

Administrators, I have bro version bro-0.9a9 running. I see files in /usr/local/bro/logs correctly, but the reports are empty. The other problem is the /usr/local/bro/archive direttory is empty too. What can I do to generate the correctly reports? I tested with one and two interfaces (etho and eth1), I'm using Red Hat Enterprise ES 3. I saw the traffice using tcpdump. Thanks! Angelita

15 years, 9 months

[Bro] &write_expire and sets

by Christian Kreibich

Hi guys, I was wondering what the semantics of &write_expire are for sets. For example, in trw.bro I see global scan_sources: set[addr] &write_expire = 1 day; The CHANGES file says that a *table* entry will be deleted if an entry isn't written to within the specified timeframe. Sets obviously don't have anything that can be written to other than the keys themselves, so for sets, I presume write_expire means that an entry has to be re- entered within the timeframe to avoid deletion? Cheers, Christian. -- ________________________________________________________________________ http://www.cl.cam.ac.uk/~cpk25 http://www.whoop.org

15 years, 9 months

[Bro] Reports

by Angelita de Cássia Corrêa

In the logs directory /usr/local/bro/logs, I have logs about my scan tests and real traffic, but if I run the site-report.pl and mail_reports.sh scripts, they don't show the scans and incidents. What the best form to resolve this? The report shows somes local IPs, but it doesn't show the scans or incidents details. And if I generate other reports with new logs the report was the same :( Thanks Angelita

15 years, 9 months

[Bro] [Fwd: [tcpdump-workers] [ANNOUNCE] NTAR - PCAP next generation dump file format implementation]

by Christian Kreibich

Hi, I'm forwarding this from the tcpdump-workers list since it's of interest to various folks around here. http://marc.10east.com/?l=tcpdump-workers&m=111974735317039&w=2 Best, Christian. -------- Forwarded Message -------- > From: Gianluca Varenni <gianluca.varenni(a)gmail.com> > Reply-To: tcpdump-workers(a)lists.tcpdump.org > To: winpcap-users(a)winpcap.org, tcpdump-workers(a)lists.tcpdump.org, > Ethereal development <ethereal-dev(a)ethereal.com> > Subject: [tcpdump-workers] [ANNOUNCE] NTAR - PCAP next generation dump > file format implementation > Date: Sat, 25 Jun 2005 17:15:34 -0700 > Hi all. > > This mail is to announce the birth of the NTAR project. NTAR stands for > Network Trace Archival and Retrieval library, and is an implementation of > the PCAP next generation dump file format, that was proposed and discussed > last year by several folks on the libpcap/tcpdump and WinPcap mailing lists. > The library is released under the 3-clause/BSD license. > > The URL of the project is: > > http://www.winpcap.org/ntar > > On this website you can find > - the source file of the library (both for windows and *nix) > - the HTML documentation of the API (generated with doxygen from the > commented source files), both for the user and for someone wanting to > extend it. The docs contain some tests/examples that you can look to > get an idea of how the library works. > - An updated version of the PCAP draft specifying the file format. > The original draft of the file format is available at > http://www.tcpdump.org/pcap/pcap.html > > > > I'm seeking contributors to improve the library in terms of > - testing the library on different platforms and operating systems > - reviewing the API > - implementing new extensions to the library. > > A mailing list, ntar-workers(a)winpcap.org, has been created for NTAR-related > discussions. People interested in this project are welcome to join it, the > mailman web interface to subscribe is available at > > https://www.winpcap.org/mailman/listinfo/ntar-workers > > Have a nice day > Gianluca Varenni -- ________________________________________________________________________ http://www.cl.cam.ac.uk/~cpk25 http://www.whoop.org

15 years, 9 months

Re: [Bro] Bro on Linksys Router.

by Vern Paxson

> /tmp/bro/bro/policy/pcap.bro, line 62: error: unknown identifier log, at > or near "log" What version of Bro are you using? 0.9 has changed "log" to "alarm". In addition, pcap.bro that ships with the latest 0.9 doesn't have a line like the one you show. Vern

15 years, 9 months

[Bro] Bro on Linksys Router.

by Jim Mellander

I've been tinkering with getting bro running on a Linksys commodity router which has a MIPS processor & runs linux. bro has been compiled for MIPS & transferred to the linksys. The folks at www.openwrt.org have made up quite a nice distribution. It actually is a nice general purpose (albeit tiny) Linux box. The tmp directory is in ram, the rest is actually in flash memory in compressed form, and is read-write, so you actually have a persistant file system (although, of course, flash has a limited number of re-write cycles, so you wouldn't want to abuse that property). It makes it nice for installing custom software, tho'. Anyway, bro gets this error when starting up: /tmp/bro/bro/policy/pcap.bro, line 62: error: unknown identifier log, at or near "log" ---- Here's where it fails: function install_default_pcap_filter() { if ( ! install_pcap_filter(DefaultPcapFilter) ) log fmt("%.6f Can't install default pcap filter (cmdline override?)", network_time()); } ---- which sort of indicates to me that somehow the lexical analysis code is incomplete, and 'log' is not being identified as a keyword. Any ideas? -- Jim Mellander Incident Response Manager Computer Protection Program Lawrence Berkeley National Laboratory (510) 486-7204 Your fortune for today is: "I've seen, I SAY, I've seen better heads on a mug of beer" -- Senator Claghorn

15 years, 9 months

Re: [Bro] Enabling Router blocks

by Vern Paxson

Ah - I see the problem. I misinterpreted: > >> However, when I start bro I get error: can't open drop. to mean it was coming from the shell. But it's coming from Bro. There isn't any policy script called drop.bro, so it's telling you that "@load drop" failed. You turn on address dropping by @load scan redef can_drop_connectivity = T; and redefining "drop_connectivity_script" (which it sounds like you've already done). Vern

15 years, 9 months

Re: [Bro] Question about HTTP policy capture filters

by Vern Paxson

> I am trying to get bro (9a8) to capture http events that are not coming > over port 80/tcp as well as several other ports. The only way to do this currently is to modify Sessions.cc to add the other ports of interest (search on "80" to see where the additions are needed). You'll also need to change the capture filter in http-request.bro (or make your own version that adds the port to capture_filters - that's cleaner). > http-request.bro: > "not tcp dst port 80 and not tcp dst port 8080" > > However, bro seems to be only reading one filter and not the second part > of filter. This is strange - Sessions.cc already treats 8080 (and 8000 and 3128) the same as 80. Can you provide a trace that exhibits the problem? Vern

15 years, 9 months

Re: [Bro] detect Ack flooding attack

by Vern Paxson

I've finally had a chance to look into this - sorry about the delay. I had misinterpreted your original comment - I thought you were asking about detecting ACK scanning, not flooding. Bro doesn't have a flood-detection script other than for SYN flooding (which is in synflood.bro), so it's expected that it wouldn't detect this. (FYI, I have a tweak to it for detecting ACK scanning, but this is tricky because it's hard to distinguish between ACK scanning and SYN flooding backscatter.) > The attachment is a small trace file. thanks FYI, the trace has numerous checksum errors (confirmed by tcpdump) - something to be aware of when analyzing it. Vern

15 years, 9 months

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zeek June 2005