Low cost antivirus for object storage

Low cost Antivirus for Oracle Cloud object store

Overview

Improve security and maintain compliance by building a low cost antivirus to scan all your objects in a bucket and also scan an object when it is created using only an OCI instance and open source software.

You can store an unlimited amount of unstructured data of any content type in your internet-scale and high-performance object storage . You may want to run an antivirus to identify threats and then move those infected objects to another bucket called quarantine.

We are going to use Clamav open source antivirus engine for detecting trojans, viruses, malware and other malicious threats for this solution.

Deploy using OCI Console

To setup this environment you need to have all the required privileges in the compartment or be part of an administrator group.

You can spin up your instance on a different Compartment and a new Virtual Cloud Network using a VCN Wizard or you can just start your instance on an existing subnet. It is all up to you.

We are going to use a new compartment called Scan and a new VCN using the Wizard. Besides that you'll need to setup the following resources:

Compartment and VCN

Create a new compartment called Scan and annotate the compartment OCID. Create a VCN called ScanVCN using a VCN Wizard with internet connectivity.

Object Storage

1. Select a bucket with objects to scan and enable Emit Object Events on it or create a new bucket. Name: checkinobj
2. Create a standard bucket to move infected object to it. Name: quarantine

Security

3. Create a Dynamic Group with a rule that will qualify your instance. Name: ScanDynGroup Get the compartment_ocid to put in the Matching Rules.

All {instance.compartment.id = 'ocid1.compartment.oc1..aaaaaaaa......algq'} 

1. Create a policy to allow your Dynamic Group to manage objects. Name: ScanPolicy We are giving access in tenancy so you can scan any bucket.

Allow dynamic-group dyngroupscan to manage buckets in tenancy
Allow dynamic-group dyngroupscan to manage objects in tenancy
Allow dynamic-group dyngroupscan to manage stream-family in compartment Scan
Allow service objectstorage-sa-saopaulo-1 to manage object-family in tenancy

Stream

5. Create a stream to receive event from object creation. Name ScanStream for this component you need to annotate the streamID and endpoint

streamingID = "ocid1.stream.oc1.sa-saopaulo-1.amaaaa......moxla"
endpoint = "https://cell-1.streaming.sa-saopaulo-1.oci.oraclecloud.com"

Event

6. Create an event to track object create on bucket checkinobj and write to ScanStream. Name: ScanEventRule

ssh Key par

7. Generate a ssh key par to use with your instance.

Deploy Using Oracle Resource Manager

1. Click

   If you aren't already signed in, when prompted, enter the tenancy and user credentials.

2. Review and accept the terms and conditions.

3. Select the region where you want to deploy the stack.

4. Follow the on-screen prompts and instructions to create the stack.

5. After creating the stack, click Terraform Actions, and select Plan.

6. Wait for the job to be completed, and review the plan.

   To make any changes, return to the Stack Details page, click Edit Stack, and make the required changes. Then, run the Plan action again.

7. If no further changes are necessary, return to the Stack Details page, click Terraform Actions, and select Apply.

Deploy Using the Terraform CLI

Clone the Module

Now, you'll want a local copy of this repo. You can make that with the commands:

git clone https://github.com/Everson4t/antivirus-for-objectstore
cd antivirus-for-objectstore
ls

Prerequisites

First off, you'll need to do some pre-deploy setup. That's all detailed here.

Secondly, create a terraform.tfvars file and populate with the following information:

# Authentication
tenancy_ocid       = "<tenancy_ocid>"
user_ocid          = "<user_ocid>"
fingerprint        = "<finger_print>"
private_key_path   = "<pem_private_key_path>"

# Region
region             = "<oci_region>"

# Compartment
compartment_ocid   = "<compartment_ocid>"

Create the Resources

Run the following commands:

terraform init
terraform plan
terraform apply

Destroy the Deployment

When you no longer need the deployment, you can run this command to destroy the resources:

terraform destroy

How to use with SCAN

To scan your bucket do the following:

1. Get a small python script called scan_bucket.py and run it to check for virus and move infected objects to quarantine.

wget https://raw.githubusercontent.com/Everson4t/antivirus-for-objectstore/main/scripts/scan_bucket.py
sudo python3 scan_bucket.py <your_bucket> quarantine

How to use with PROTECT

To protect your bucket scanning objects created on it do the following:

1. Get a small python script called scan_obj_create.py to check streaming and scan new objects.

   You need to provide source and target buckets and streaming OCID and endpoint that you can get from OCI console or terraform output

wget https://raw.githubusercontent.com/Everson4t/antivirus-for-objectstore/main/scripts/scan_obj_create.py
sudo python3 scan_obj_create.py checkinobj quarantine <stream_ocid> <stream_endpoint> 

How to test with a fake threat

1. Copy this string to a file called EICAR_TEST.

X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*

2. Upload the file you just created to a bucket using the correct objects namespace.

oci os ns get --auth instance_principal
oci os object put -ns <namespace> -bn checkinobj --name infected_01.txt --file EICAR_TEST --auth instance_principal

3. Run the scripts to detect and move the infected objects to quarantine.

4. You can generate a test file with the python package we intalled before doing the following as root user

python3
>>> import pyclamd
>>> cdsocket = pyclamd.ClamdUnixSocket()
>>> void = open('/root/EICAR_TEST','wb').write(cdsocket.EICAR())

Roadmap and extensions

1. Implement this solution with a different or commercial antivirus.
2. Make the protect program a daemon to read the stream constantly.
3. Test for a bigger Unix socket size for the scan. Actually 1000MB
4. Send an alert e-mail when a threat is found.
5. Implement error handling, timeout and a better python program.
6. Any great idea you may have.

References

Calling Services from an Instance:
Managing Dynamic Groups:
Writing authorization policies for Dynamic Groups:
OCI Command Line Interface (CLI):
CLI supported OS and Python versions:
OCI CLI Quick Start:
Instance Principals:

Authors and acknowledgment

I'd like to say thank you very much to Fabio Silva and Fernando Costa who help me to build this project

License

Clam AntiVirus is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.