What?

This project builds an OSQuery module libbro.so for loading bro logs as tables in osquery.

The logs are dynamically loaded into tables from the bro logs installation directory. They are created as tables based on their log file name, except pre-pended with bro_. E.g., conn.log -> table bro_conn.

Example

From EnvDB UI:

Building and Installing

To build, you need cmake, clang, git (for both osquery and module builds).

make deps
make

This will create the module ./build/src/libbro.<dylib|so>

You will then need to copy this to /usr/local/lib/libbro.<dylib|so> and then you can add an entry to /etc/osquery/modules.load:

$ sudo cp -r ./build/src/libbro.<dylib|so> /usr/local/lib
$ sudo mkdir -p /etc/osquery/
$ sudo sh -c 'echo "/usr/local/lib/libbro.<so|dylib>" >> /etc/osquery/modules.load'

You can now run osqueryi with the location of $BROLOGS set to the bro logs path, where it will attempt to load log tables from $BROLOGS.

Example:

sudo BROLOGS="$PWD/bro/logs" osqueryi

Without BROLOGS set, it will try to load logs from the following common Bro installation locations:

/usr/local/bro/logs/current
/opt/bro/logs
/nsm/bro/logs/current

Installing for EnvDB

To get it to work with EnvDB, you need to create a wrapper script for osqueryi that supplies the correct environment variable for the BROPATH. This should be in your path before osqueryi.

E.g., add this to your path:

root@vagrant-ubuntu-trusty-64:~# more /usr/bin/osqueryi
#!/bin/sh
BROLOGS="/path/to/bro/logs" /path/to/real/osqueryi "$@"

You can also try setting BROLOGS=xxx in EnvDB startup although I'm not certain that works.

TODO

• Better Bro log path detection.
• Add variable BROLOGS to specify where the bro logs are, or maybe a more flexible way to supply this to osquery.
• Better type handling? Better error handling?

General wishlist: I wish osquery had a nicer way of loading any log dynamically into its framework. :)