This extension adds a Bro interface to the host monitor osquery, enabling the network monitor Bro to subscribe to changes from hosts as a continous stream of events. The extension is controlled from Bro scripts, which sends SQL-style queries to the hosts and then begins listening for any updates coming back. Host events are handled by Bro scripts the same way as network events.
Here, you see an example script to be loaded by Bro, using osquery and our bro-osuqery framework to make hosts report about server applications as soon as it starts.
event host_server_apps(resultInfo: osquery::ResultInfo,
username: string, name: string, port_number: int)
{
print fmt("[Host %s] User '%s' is running server application '%s' on port %d", resultInfo$host, username, name, port_number);
}
event bro_init()
{
Broker::enable();
local query = [$ev=host_server_apps, $query="SELECT u.username, p.name, l.port from listening_ports l, users u, processes p WHERE l.pid=p.pid AND p.uid=u.uid and l.address NOT IN ('127.0.0.1', '::1')"];
osquery::subscribe(query);
}
Bro-Osquery is a platform for infrastructure monitoring, combining network and host monitoring. Bro is used to capture, log and analyze network packets. To retrieve information of hosts in the network, there is the osquery agent running on hosts. Osquery can be instrumented by Bro to send information about software and hardware changes.
Both types of events, from network and hosts, are transparently handled with Bro scripts. We provide an easy to use interface in Bro to manage groups of hosts and to subscribe to host status changes.
For the Bro-Osquery Project to run, you need to deploy osquery on respective hosts to be monitored. Additionally, Bro has to be loaded with the osquery framework script to enable the communication with the hosts.
Bro Script Framework can be found in this Github repository at path bro/osquery. To make the scripts available in Bro, either copy/link this folder into $PREFIX/share/bro/site (see Bro manual) or make the environment variable BROPATH to point to the framework folder (see Bro manual). Once you placed the osquery framework, start Bro with the scripts, e.g.:
bro -i eth0 osquery
Osquery is originally a standalone host monitor. We are currently integrating our project into osquery. The latest version of this integration branch is also available as a Github repository. While we are working on integration, you can check out this version.
git clone https://github.com/iBigQ/osquery.git
cd osquery && git checkout bro_integration
make deps && make
sudo make install
After installation, you can start the osquery daemon and the bro extension:
sudo osqueryd --verbose --logger_plugin bro --config_plugin filesystem --log_result_events=0 --disable-bro=false --bro-ip="172.17.0.2"
Please make sure that the bro-ip matches the Bro installation running the osquery framework.
As an example, you should be able to see Bro logfiles named osq-processes.log and osq-mounts.log.