zeek-dev July 2016

zeek-dev@lists.zeek.org

14 discussions

[Bro-Dev] input-framework file locations

by Aashish Sharma

I have been thinking and trying different things but for now, it appears that if we are to share policies around, there is no easy way to be able to distribute input-files along with policy files. Basically, right now I use redef Scan::whitelist_ip_file = "/usr/local/bro/feeds/ip-whitelist.scan" ; and then expect everyone to edit path as their setup demands it and place accompanying sample file in the directory or create one for themselves - this all introduces errors as well as slows down deployment. Is there a way I can use relative paths instead of absolute paths for input-framework digestion. At present a new-heuristics dir can have __load__.bro with all policies but input-framework won't read files relative to that directory or where it is placed. redef Scan::whitelist_ip_file = "../feeds/ip-whitelist.scan" ; Something similar to __load__.bro model Also, one question I have is should all input-files go to a 'standard' feeds/input dir in bro or be scattered around along with their accompanied bro policies (ie in individual directories ) Something to think about as with more and more reliance on input-framework i think there is a need for 'standardization' on where to put input-files and how to easily find and read them. Aashish

3 years, 9 months

[Bro-Dev] package manager progress

by Siwek, Jon

The package manager client is at a point now where I think it would be usable. Documentation is here: https://bro.github.io/package-manager/ There is a branch in the ‘bro’ repo called ‘package-manager’ that simply changes CMake scripts to install ‘bro-pkg’ along with bro. Here’s an example usage/session: $ git clone --recursive --branch=package-manager git://bro.org/bro ... $ cd bro && ./configure && make install ... $ /usr/local/bro/bin/bro-pkg list all default/jsiwek/bro-test-package $ /usr/local/bro/bin/bro-pkg install bro-test-package installed "bro-test-package" loaded "bro-test-package" $ /usr/local/bro/bin/bro packages loaded bro-test-package plugin loaded bro-test-package scripts $ /usr/local/bro/bin/broctl Test package: initialized … That test package shows that bro-pkg was able to install a package containing Bro scripts, a Bro plugin, and a BroControl plugin and everything should “just work” without needing any configuration. Roadmap/TODO/Questions: * Add a way for package’s to define “discoverability metadata”. E.g. following the original plan for this would involve putting something like a “tags” field in each package’s pkg.meta file, but the problem with this is the client would need to either download every package to be able to search this data or have a third-party periodically aggregate it. My current idea is that instead of putting this type of data inside the package’s metadata, the user puts it in the package source’s metadata. They do this on first registration and may update it whenever. That way, bro-pkg always has access to latest discoverability metadata, no need for a separate aggregation process. It’s also something that will rarely change, so not a problem for that data to live in a repo not owned by the package author and not much increased burden for Bro Team to accept pull requests to update this data. Thoughts? * Automatic inter-package dependency analysis Simply a TODO. I put it at lower priority since I don’t think it will be common right off the bat to have complex package dependencies and users can always manually resolve dependencies at the moment. * Is it acceptable to depend on GitPython and semantic_version python packages? Both are replaceable implementation details, just didn’t want to write something myself if not necessary and in interest of time. * Documentation is hosted on GitHub at the moment, move to bro.org? Mostly just on GitHub now to be able to show something without having to touch any of the master bro/www doc generation processes, but maybe it’s a nice thing to start keeping docs more compartmentalized? The current doc/www setup feels like it’s getting rather large/monolithic and maybe that contributes to the difficulty of approaching/understanding it when there’s breakages. Just an idea. * Thoughts on when to merge ‘package-manager’ branch in ‘bro’ ? IMO, it can be done now or soon after I address responses/feedback to this email. - Jon

4 years, 10 months

[Bro-Dev] Making scan.bro great again.

by Azoff, Justin S

I took a closer look at scan-NG and at the scan.bro that shipped with 1.5 to understand how the detection could be better than what we have now. 1.5 wasn't fundamentally better, but compared to what we are doing now it has an unfair advantage :-) I found that it used tables like this: global distinct_ports: table[addr] of set[port] &read_expire = 15 mins &expire_func=port_summary &redef; Not only is it using a default timeout of 15 minutes vs 5 minutes, it is using read_expire. This means that an attacker can send one packet every 14 minutes 25 times and still be tracked. Meaning scan.bro as shipped with 1.5 can pick up slow scans over as much as a 6 hour period. The sumstats based scan.bro can only detect scans that fit in the fixed time window (it is effectively using create_expire, but as Aashish points out, limited even further since the 'creation time' is a fixed interval regardless of when the attacker is first seen) The tracking that 1.5 scan.bro has isn't doing anything inherently better than what we have now, it's just doing it over a much longer period of time. The actual detection it uses has the same limitations the current sumstats based scan.bro has: it does not detect fully randomized port scans. It would benefit from the same "unification" changes. Since that fixing sumstats and adding new functionality to solve this problem in a generic way is a huge undertaking, I tried instead to just have scan.bro do everything itself. We may not be able to easily fix sumstats, but I think we can easily fix scan.bro by making it not use sumstats. To see if this was even viable or a waste of time I wrote the script: it works. It sends new scan attempts to the manager and stores them in a similar '&read_expire = 15 mins' table. This should detect everything that the 1.5 based version did, plus all the fully random scans that were previously missed. And with the simpler unified data structure and capped set sizes it will use almost zero resources. Attached is the code I just threw on our dev cluster. It's the implementation of "What is the absolute simplest thing that could possibly work". It uses 1 event and 2 tables, one for the workers and one for the manager. What does this look like from a CPU standpoint? [cid:9351b696-d4ba-4a9c-820f-8c156f24e3f5@mx.uillinois.edu] This graph shows a number of experiments. * The first block around 70% is the unified sumstats based scan.bro plus hacked up sumstats/cluster.bro to do data transfer more efficiently * The next block at 40% was the unified scan.bro hacked up to make the manager do all the sumstats (worked, but had issues) * The small spike upwards back to 70% was a return to the unified scan.bro that is in git with the threshold changed back to 25 * The spike up to 170-200% was a return to stock sumstats/cluster.bro. This is what 2.5 would be with sumstats based scan.bro * The drop back down to 40% is the switch to the attached scan.bro that does not use sumstats at all. The 'duration' is TODO in the notices, but otherwise everything works. I want to just get the start time directly from the time information in the table.. I'm not sure if bro exposes it or even stores it in a usable way. If there's no way to get it out of the table I just need to track when an attacker is first seen separately, but that is easy enough to do. -- - Justin Azoff

4 years, 10 months

[Bro-Dev] testing topic/dnthayer/ticket1627

by Aashish Sharma

HI Daniel, Are there any specific node.cfg settings or broctl.cfg settings to run the Logging node ? Could you please point me to the right locations. Thanks, Aashish

4 years, 10 months

[Bro-Dev] New documentation via Sphinx

by Matthias Vallentin

I'm in the process of documenting Broker with Sphinx. With minimal effort, I put up a scaffold that looks like this: http://bro.github.io/broker/ It's the bootstrap theme for sphinx, as an alternative to the classic read-the-docs theme. I've hacked the sidebar so that it shows the table of contents. The nice thing about this setup is that it doesn't require any server-side support. I just type `make doc` locally and can open the HTML pages. I pushed the above to broker's gh-pages branch so that you can view it under the above github.io URL. Search is also implemented via JS and works great. Sphinx also has a plugin to also generate a PDF Version of the manual, which I've put here: http://docdro.id/rHNvn1X. Don't look too much at the content, I'm just getting started. But the whole setup looks really simple and could be a good starting point for the next Bro documentation overhaul. Matthias

4 years, 10 months

[Bro-Dev] Broker data store API

by Matthias Vallentin

TL;DR: - Does anyone use Broker's RocksDB backend? - Brief overview of the revamped data store frontend API I've been working on the Broker data store API a bit, trying to come with the smallest denominator possible for an initial release. So far I have ported the in-memory SQLite backend over. This made me wonder: did anyone ever use (or wanted to use) the RocksDB in production? I wonder if we can keep it out for Bro 2.5. Regarding the API, here's a snippet that illustrates the user-facing parts: // Setup an endpoint. context ctx; auto ep = ctx.spawn<blocking>(); // Attach a master datastore with backend. The semantics of // "attaching" are open-or-create: if a master exists under the // given name, use it, otherwise create it. backend_options opts; opts["path"] = "/tmp/test.db"; auto ds = ep.attach<master, sqlite>("foo", std::move(opts)); if (!ds) std::terminate(); // Perform some asynchronous operations. ds->put("foo", 4.2); ds->put(42, set{"x", "y", "z"}); ds->remove(42, "z"); // data at key 42 is now {"x", "y"} ds->increment("foo", 1.7); // data at key "foo" is now 5.7 // Add a value that expires after 10 seconds. ds->put("bar", 4.2, time::now() + std::chrono::seconds(10)); // Get data in a blocking fashion. auto x = ds->get<blocking>("foo"); // Equivalent to: get("foo"), the // blocking API is the default. // Get data in a non-blocking fashion. The function then() returns // immediately and one MUST NOT capture any variables on the stack by // reference in the callback. The runtime invokes the callback as soon // as the result has arrived. ds->get<nonblocking>("foo").then( [=](const data& d) { cout << "data at key 'foo': " << d << endl; }, [=](const error& e) { if (e == ec::no_such_key) cout << "no such key: foo" << endl; } }); Here's another setup with two peering endpoints, one having a master and one a clone (directly taken from the unit tests). This illustrates how data stores and peering go hand in hand. context ctx; auto ep0 = ctx.spawn<blocking>(); auto ep1 = ctx.spawn<blocking>(); ep0.peer(ep1); auto m = ep0.attach<master, memory>("flaka"); auto c = ep1.attach<clone>("flaka"); REQUIRE(m); REQUIRE(c); c->put("foo", 4.2); std::this_thread::sleep_for(propagation_delay); // master -> clone auto v = c->get("foo"); REQUIRE(v); CHECK_EQUAL(v, data{4.2}); c->decrement("foo", 0.2); std::this_thread::sleep_for(propagation_delay); // master -> clone v = c->get("foo"); REQUIRE(v); CHECK_EQUAL(v, data{4.0}); I think this API covers the most common use cases. It's always easy to add functionality later, so my goal is to find the smallest common denominator. Matthias

4 years, 10 months

[Bro-Dev] IP-in-IP tunnel: issue with capture length

by Dirk Leinenbach

Hi, I'm having problems with IP-in-IP tunneled traffic which contains an ethernet frame check sequence (FCS). 1) Bro seems to attribute the FCS to the length of the outer IP packet and then complains that the inner IP packet is too small compared to the capture length (in weird.log: "inner_IP_payload_length_mismatch") Then I thought it would be ok to simply drop the corresponding check in Sessions.c: ParseIPPacket() because too much content shouldn't "hurt". - if ( (uint32)caplen != inner->TotalLen() ) - return (uint32)caplen < inner->TotalLen() ? -1 : 1; + if ( (uint32)caplen < inner->TotalLen() ) + return -1; Would that be ok in your opinion? If not, what would be a better way to deal with this? 2) With the above patch applied, bro correctly sees the inner traffic, but from time to time it segfaults (every other day roughtly). Until now i figured out the following information, but cannot really see what's going wrong: a) bro always crashes at a tunneled TCP packet with active reset flag b) I see very few such packets (it might be that the crashing one is the only within quite some time before the crash: I don't have all traffic available) c) I cannot reproduce the problem by simply starting bro on a pcap file with the offending packet (and ~100MB traffic before the crash) (even valgrind doesn't report anything useful) From the stacktrace of the core file (cf. below) it looks as if PacketWithRst() somehow triggered the destructor of (my own) SIP plugin. However, I have no idea how that could happen. Could you help me with this problem? Thanks, Dirk #0 std::_List_base<plugin::BifItem, std::allocator<plugin::BifItem> >::_M_clear (this=this@entry=0x2f373b0) at /usr/include/c++/4.7/bits/list.tcc:74 #1 0x00000000006a0ade in ~_List_base (this=0x2f373b0, __in_chrg=<optimized out>) at /usr/include/c++/4.7/bits/stl_list.h:379 #2 ~list (this=0x2f373b0, __in_chrg=<optimized out>) at /usr/include/c++/4.7/bits/stl_list.h:436 #3 plugin::Plugin::~Plugin (this=0x2f37360, __in_chrg=<optimized out>) at bro/src/plugin/Plugin.cc:136 #4 0x00007f1fa7d2ef77 in ~Plugin (this=0x2f37360, __in_chrg=<optimized out>) at sip/src/Plugin.cc:8 #5 plugin::Consistec_SIP::Plugin::~Plugin (this=0x2f37360, __in_chrg=<optimized out>) at sip/src/Plugin.cc:8 #6 0x000000000079d4bd in PacketWithRST (this=0x3482680) at bro/src/analyzer/protocol/tcp/TCP.cc:1810 #7 analyzer::tcp::TCP_Analyzer::DeliverPacket (this=0x3482680, len=0, data=0x7f1fa16f9aca <Address 0x7f1fa16f9aca out of bounds>, is_orig=false, seq=<optimized out>, ip=0x34e05c0, caplen=0) at bro/src/analyzer/protocol/tcp/TCP.cc:1280 #8 0x0000000000807a6a in analyzer::Analyzer::NextPacket (this=0x3482680, len=20, data=<optimized out>, is_orig=<optimized out>, seq=<optimized out>, ip=<optimized out>, caplen=20) at bro/src/analyzer/Analyzer.cc:222 #9 0x000000000055ecee in Connection::NextPacket (this=0x2f48c00, t=<optimized out>, is_orig=<optimized out>, ip=<optimized out>, len=<optimized out>, caplen=<optimized out>, data=<optimized out>, record_packet=@0x7ffc33d50898: 1, record_content=@0x7ffc33d5089c: 1, hdr=0x7ffc33d50b10, pkt=0x7f1fa16f9aa2 <Address 0x7f1fa16f9aa2 out of bounds>, hdr_size=0) at bro/src/Conn.cc:260 #10 0x00000000005f819a in NetSessions::DoNextPacket (this=this@entry=0xf25000, t=1468916092.7505391, t@entry=<error reading variable: Could not find type for DW_OP_GNU_const_type>, hdr=hdr@entry=0x7ffc33d50b10, ip_hdr=ip_hdr@entry=0x34e05c0, pkt=pkt@entry=0x7f1fa16f9aa2 <Address 0x7f1fa16f9aa2 out of bounds>, hdr_size=hdr_size@entry=0, encapsulation=0x0, encapsulation@entry=0x34b3138) at bro/src/Sessions.cc:757 #11 0x00000000005f91a4 in NetSessions::DoNextInnerPacket (this=0xf25000, t=1468916092.7505391, hdr=<optimized out>, inner=0x34e05c0, prev=<optimized out>, ec=...) at bro/src/Sessions.cc:805 #12 0x00000000005f88ca in NetSessions::DoNextPacket (this=this@entry=0xf25000, t=1468916092.7505391, t@entry=<error reading variable: Could not find type for DW_OP_GNU_const_type>, hdr=hdr@entry=0xf762a0, ip_hdr=<optimized out>, ip_hdr@entry=0x7ffc33d50e60, pkt=pkt@entry=0x7f1fa16f9a80 <Address 0x7f1fa16f9a80 out of bounds>, hdr_size=hdr_size@entry=14, encapsulation=encapsulation@entry=0x0) at bro/src/Sessions.cc:665 #13 0x00000000005f96d6 in NetSessions::NextPacket (this=0xf25000, t=1468916092.7505391, hdr=0xf762a0, pkt=0x7f1fa16f9a80 <Address 0x7f1fa16f9a80 out of bounds>, hdr_size=14) at bro/src/Sessions.cc:231 #14 0x00000000005c8048 in net_packet_dispatch (t=1468916092.7505391, hdr=0xf762a0, pkt=0x7f1fa16f9a80 <Address 0x7f1fa16f9a80 out of bounds>, hdr_size=14, src_ps=0xf76160) at bro/src/Net.cc:277 -- Dr.-Ing. Dirk Leinenbach - Leitung Softwareentwicklung consistec Engineering & Consulting GmbH ------------------------------------------------------------------ Europaallee 5 Fon: +49 (0)681 / 959044-0 D-66113 Saarbrücken Fax: +49 (0)681 / 959044-11 http://www.consistec.de e-mail: dirk.leinenbach(a)consistec.de Registergericht: Amtsgericht Saarbrücken Registerblatt: HRB12003 Geschäftsführer: Dr. Thomas Sinnwell, Volker Leiendecker, Stefan Sinnwell

4 years, 11 months

[Bro-Dev] Unified scan.bro script

by Azoff, Justin S

As part of the sumstats things I've been looking into I tried refactoring scan.bro to put less load on sumstats. The refactored script is at https://gist.github.com/JustinAzoff/fe68223da6f81319d3389c605b8dfb99 It is.. amazing! The unified code is simpler, uses less memory, puts less load on sumstats, generates nicer notice messages, and detects attackers scanning across multiple victims AND ports. Details: The current scan.bro maintains two sumstats streams keyed by attacked ip and port. When attacker attempts to connect to victim on port 22, sumstats effectively creates: an [attacker 22] key with data containing [victim] an [attacker victim] key with data containing [22] It does this so it can figure out if an attacker is scanning lots victims on one port, or lots of ports on one victim. When an attacker does the equivalent of 'nmap -p 22 your/16', sumstats ends up with 65536 extra [attacker victim] keys. This kills the sumstats :-) my refactored version simply creates: an [attacker] key containing [victim/22, othervictim/22, ...] This means that no matter how many hosts or ports attacker scans, there will only ever be one key. Additionally, since the reducer is configured as ... $apply=set(SumStats::UNIQUE), $unique_max=double_to_count(scan_threshold+2) the data the key references can not grow unbounded, so a full /16 port scan can only create 1 key and scan_threshold+2 values per worker process. This is a huge reduction in the amount of data stored. The downside of this was that the notices were effectively "attacker scanned... something!", but I realized I could analyze all the victim/port strings in unique_vals and figure out what was scanned. With that in place, bro now generates notices like this: Scan::Scan 198.20.69.98 made 102 failed connections on 102 hosts and 77 ports in 4m59s Scan::Scan 198.20.99.130 made 102 failed connections on 102 hosts and 78 ports in 4m59s Scan::Scan 36.101.163.186 made 102 failed connections on port 23 in 0m14s Scan::Scan 91.212.44.254 made 102 failed connections on ports 135, 445 in 4m59s Scan::Scan 207.244.70.169 made 103 failed connections on port 389 in 5m0s Scan::Scan 222.124.28.164 made 102 failed connections on port 23 in 0m14s Scan::Scan 91.236.75.4 made 102 failed connections on ports 8080, 3128 in 4m58s Scan::Scan 177.18.254.165 made 102 failed connections on port 23 in 0m38s Scan::Scan 14.169.221.169 made 102 failed connections on port 23 in 0m36s Scan::Scan 192.99.58.163 made 100 failed connections on 100 hosts and 100 ports in 4m55s The only downside is that 192.99.58.163 appears to be backscatter (conn_state and history are OTH H), but that's an issue inside is_failed_conn somewhere which is unchanged from scan.bro It should be a drop in replacement for scan.bro other than that any notice policies or scan policy hooks will need to be changed. It could possibly be changed to still raise Address_Scan/Port_Scan notices at least in some cases. I don't know how people may be using those notices differently - we handle them the same, so the change to a unified notice type is a non-issue for us. -- - Justin Azoff

4 years, 11 months

[Bro-Dev] Remove application/pkix-cert from files.log?

by Seth Hall

What does everyone think of making some change for 2.5 so that certificates from SSL aren't logged in the files.log by default? I've heard grumblings about the number of certs that show up from quite a few people and personally noticed that the number of certificates will dwarf all other files types pretty badly which makes the output look a bit weird since very few people are ever interested in looking at those files in the files.log. Certificates would still be passed through the files framework, so it's not an architectural change, it would all be related to just not doing the log. There is one minor issue that this brings up though in that right now certificate hashes are all given in the files.log. We could move them elsewhere like x509.log or ssl.log, but I'm curious if anyone had thoughts on what they think would be most useful? .Seth -- Seth Hall International Computer Science Institute (Bro) because everyone has a network http://www.bro.org/

4 years, 11 months

[Bro-Dev] Some thoughts on the bro deep cluster, broker, and sumstats

by Mathias Fischer

*tl;dr* I continued my work on the bro deep cluster in the last months and just want to share my outcome so far and future plans with you: 1. I want to get your opinion on my broker enhancement that allows to route messages in between not directly connected peers (given that there is a path between them). 2. I want to share some preliminary thoughts on how to enhance the sumstats framework to a deep cluster setting, so that it is possible to create (multiple) subgroups of bros (dynamically) in the deep cluster that can share and aggregate information. Criticism, opinions, and further suggestions are very welcome! Best, Mathias -------------------- Summary deep cluster -------------------- A deep cluster provides one administrative interface for several conventional clusters and/or standalone Bro nodes at once. A deep cluster eases the monitoring of several links at once and can interconnect different Bros and different Bro clusters in different places. Due to its better scalability it can bring monitoring from the edge of the monitored network into its depth (-> deep cluster). Moreover, it enables and facilitates information exchange in between different Bros and different Bro clusters. In essence, a deep cluster can be seen as a P2P overlay network of Bro nodes, so that all Bros can communicate with each other. In summary, my outcome so far towards building such a deep-cluster is the following * a modified multi-hop broker that allows to forward content in between peers that are only connected indirectly with each other. * some bro modifications in code and foremost in bro script land * an enhanced broctl that operates as daemon and that can initiate connections to other such daemons (all communication based on broker), including a json-based configuration of nodes and connections A summary of all changes can be found on the bro website (including instruction on how to run the current version of the deep cluster): https://www.bro.org/development/projects/deep-cluster.html Ongoing work is currently the adaption of my multi-hop broker to the currently revised broker and the adaption of sumstats to work in a deep cluster setting. Both is described in detail in the long (sorry) remainder of this Email. ---------------------------------- Multi-hop broker ---------------------------------- I enhanced broker to support publish-subscribe-based communication between nodes that are not connected directly, but that are connected by a path of other nodes. The working title of this is multi-hop broker. As broker gets a significant revision soon, I want to share my design for multi-hop broker with you, so that I can include your comments when adding my multi-hop functionality to the revised broker. A specific challenge here is the routing of publications to all interested subscribers. For that, routing tables need to be established among all nodes in a deep cluster. These routing tables are established by flooding subscriptions in the deep cluster. Afterwards, publications can be routed on the shortest paths to all interested subscribers In that context, two issues arise, namely loop detection and avoidance as well as limiting the scope of subscriptions for rudimentary access control. Both issues are described in detail in the following. *** Loop detection and avoidance There is no unique identifier (like an IP address) anymore on which basis you can forward information. There might be only one recipient for a publish operation, but it can be also many of them. This can result in routing loops, so that messages are forwarded endlessly in the broker topology that is a result of the peerings between broker endpoints. Such loops has to be avoided as it would falsify results, e.g., results stored in datastores. There is basically two options here: 1. Loop avoidance: During the set up phase of the deep cluster it needs to be ensured that the topology does not contain loops. 2. Loop detection: Detect loops and drop duplicate packets. This requires either to store each forwarded message locally to detect duplicates or, more light-weight, to attach a ttl value to every broker message. When the ttl turns 0, the message gets deleted. However, the ttl does not prevent duplicates completely. For multi-hop broker we chose a hybrid approach between the two options. Loops in the broker topology need to be avoided during the initial configuration of the deep cluster. A ttl that is attached to every broker message will allow to detect routing loops and will result in an error output. The ttl value can be configured, but its default value is 32. However, there are certain configurations that require a more dense interconnection of nodes. In conventional bro clusters all workers are connected to manager and datanode, while the manager is also connected to the datanode. Obviously this already represents a loop. To avoid such routing loops we introduced an additional endpoint flag ``AUTO_ROUTING``. It indicates if the respective endpoint is allowed to route message topics on behalf of other nodes. Multi-hop topics are only stored locally and propagated if this flag is set. If an auto-routing endpoint is coupled with an ordinary endpoint, only the auto-routing endpoint will forward messages on behalf of the other endpoint. As a result, not every node will forward subscriptions received by others, so that loops can be prevented even though the interconnection of nodes in the deep cluster results in topological loops. *** Rudimentary Access Control To prevent that subscriptions are disseminated in the whole deep cluster single (=local) and multi-hop (=global) subscriptions are introduced. Single-hop subscriptions are shared among the direct neighbors only and thus make them only available within the one-hop neighborhood. In contrast, multi-hop subscriptions get flooded in the whole deep clusters. The differentiation in subscriptions with local (``LOCAL_SCOPE``) and global scope (``GLOBAL_SCOPE``) is intended to provide better efficiency and is configured as additional parameter when creating a broker ``message_queue``. The default setting is always ``LOCAL_SCOPE``. --------------------------------- Deep Sumstats --------------------------------- The intention is to extend sumstats to be used within a deep cluster to aggregate results in large-scale, but also to form sumstats groups on the fly, e.g., as a result of detected events. In the original sumstats only directly connected nodes in a cluster-setup exchanged messages. By using multi-hop broker, we can extend this to the complete deep cluster. We can form small groups of nodes that are not directly connected to each other, but that rather are connected indirectly by their subscriptions to a group id (e.g., "/bro/sumstats/port-scan-detected"). To adapt sumstats to the deep cluster two basic approaches are feasible: 1. Sumstats groups: Instead of a cluster we apply sumstats on a group of nodes in the deep cluster. This means that we keep the basic structure and functioning of the current sumstats. We only replace direct links by multi-hop links via multi-hop broker. However, we need a coordinator per group (in original sumstats the manager took over this task). This manager will initiate queries and will retrieve all results via the routing mechanisms of multi-hop broker. There will be no processing or aggregation of information directly in the deep cluster. Only nodes in the group and foremost the manager will be able to process and aggregate information. The deep cluster will only provide a routing service between all members of the group. 2. Sumstats and deep cluster become one: We integrate the data forwarding and the data storage with each other. The deep cluster is used to aggregate and process results in a completely distributed manner, while forwarding data to its destination. This means that all members of a sumstats group get interconnected by the deep cluster (and thus multi-hop broker) as in option 1, but now we have additional processing and aggregation of information while it is forwarded towards the manager by nodes of the deep cluster that are not part of the sumstats group. That is definitely the most challenging option, but in the long-term probably the most valuable one. I am currently working on option 1 as it is the straightforward option and as it is also a necessary intermediate step to get to option 2. I would be especially grateful for additional input / alternate views here.

4 years, 11 months

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zeek-dev July 2016