OpenCanary

Thinkst Applied Research

Overview

In essence, OpenCanary creates a network honeypot allowing you to catch hackers before they fully compromise your systems. As a technical definition, OpenCanary is a daemon that runs several canary versions of services that alerts when a service is (ab)used.

Features

Receive email alerts as soon as potential threats are detected, highlighting the threat source IP address and where the breach may have taken place.

Prerequisites

Python 2.7, 3.6
[Optional] SNMP requires the python library scapy
[Optional] RDP requires the python library rdpy
[Optional] Samba module needs a working installation of samba

Installation

For updated and cleaner documentation, please head over to http://opencanary.org

Installation on Ubuntu:

$ sudo apt-get install python-dev python-pip python-virtualenv
$ virtualenv env/
$ . env/bin/activate
$ pip install opencanary
$ pip install scapy pcapy # optional

Ubuntu users installing rdpy should run the following before installing OpenCanary:

$ sudo apt-get install -y build-essential libssl-dev libffi-dev python-dev
$ pip install rdpy

Installation OS X needs an extra step, as multiple OpenSSL versions may exist which confounds the python libraries using to it.

$ virtualenv env/
$ . env/bin/activate

Macports users should then run:

$ sudo port install openssl
$ env ARCHFLAGS="-arch x86_64" LDFLAGS="-L/opt/local/lib" CFLAGS="-I/opt/local/include" pip install cryptography

Alternatively homebrew users run:

$ brew install openssl
$ env ARCHFLAGS="-arch x86_64" LDFLAGS="-L/usr/local/opt/openssl/lib" CFLAGS="-I/usr/local/opt/openssl/include" pip install cryptography

Now installation can run as usual:

$ pip install opencanary
$ pip install scapy pcapy # optional

To install from source, instead of running pip do the following:

$ git clone https://github.com/thinkst/opencanary
$ cd opencanary
$ python setup.py sdist
$ cd dist
$ pip install opencanary-<version>.tar.gz

If you are looking to get OpenCanary working on OpenBSD, take a look at https://github.com/8com/opencanary.

Run

OpenCanary is started by running:

$ . env/bin/activate
$ opencanaryd --start

On the first run, instructions are printed that will get to a working config.

Samba Setup (optional)

The Samba OpenCanary module monitors a log file produced by the Samba full_audit VFS module. Setup relies on:

Having Samba installed.
A modified Samba config file, to write file events to syslog's LOCAL7 facility.
A modified syslog file, to output LOCAL7 to a samba-audit.log file.

As template Samba config, modify the following and install it to the right location (often /etc/samba/smb.conf). The lines you'll likely want to change are:

path
workgroup
server string
netbios name
[myshare]
comment

    [global]
       workgroup = WORKGROUP
       server string = blah
       netbios name = SRV01
       dns proxy = no
       log file = /var/log/samba/log.all
       log level = 0
       vfs object = full_audit
       full_audit:prefix = %U|%I|%i|%m|%S|%L|%R|%a|%T|%D
       full_audit:success = pread
       full_audit:failure = none
       full_audit:facility = local7
       full_audit:priority = notice
       max log size = 100
       panic action = /usr/share/samba/panic-action %d

       #samba 4
       server role = standalone server

       #samba 3
       #security = user

       passdb backend = tdbsam
       obey pam restrictions = yes
       unix password sync = no
       map to guest = bad user
       usershare allow guests = yes
    [myshare]
       comment = All the stuff!
       path = /home/demo/share
       guest ok = yes
       read only = yes
       browseable = yes
       #vfs object = audit

Configure syslog to write the Samba logs out to the file that OpenCanary monitors. With rsyslog, adding these two lines to /etc/rsyslog will do that:

$FileCreateMode 0644
local7.*            /var/log/samba-audit.log

For other syslog implementations similar lines might work.