Table of Contents

• Introduction

• Prerequisites

• Installation

• Quick Start

  • Status Codes

• Configuration

  • Environment Variables
  • Networking

• Maintenance / Monitoring

  • Shell Access

• Developing

• References

Introduction

This is a two in one docker image which runs the open source virus scanner ClamAV (https://www.clamav.net/), performs automatic virus definition updates as a background process and provides a REST API interface to interact with the ClamAV process.

Updates

As of October 21 2024, freshclam notifies the correct .clamd.conf so that clamd is notified about updates and the correct version is returned now. This is an additional fix to the latest fix from October 15 2024 which was not working. Thanks to christianbumann and arizon-dread.

As of October 15 2024, ClamAV was thought to handle database updates correctly thanks to christianbumann. It turned out that this was not the case.

As of May 2024, the releases are built for multiple architectures thanks to efforts from kcirtapfromspace and support non-root read-only deployments thanks to robaca.

The additional endpoint /version is now available to check the clamd version and signature date. Thanks pastral.

Closed a security hole by upgrading our Dockerfile to the alpine base image version 3.19 thanks to Marsup.

Prerequisites

This container doesn't do much on it's own unless you use an additional service or communicator to talk to it!

Installation

Automated builds of the image are available on Registry and is the recommended method of installation.

docker pull hub.docker.com/ajilaag/clamav-rest:(imagetag)

The following image tags are available:

• latest - Most recent release of ClamAV with REST API
• YYYYMMDD - The day of the release
• sha-... - The git commit sha. This version ensures that the exact image is used and will be unique for each build

Quick Start

See this docker-compose file for non-root read-only usage.

Run clamav-rest docker image:

docker run -p 9000:9000 -p 9443:9443 -itd --name clamav-rest ajilaag/clamav-rest

Test that service detects common test virus signature:

HTTP

$ curl -i -F "file=@eicar.com.txt" http://localhost:9000/scan
HTTP/1.1 100 Continue

HTTP/1.1 406 Not Acceptable
Content-Type: application/json; charset=utf-8
Date: Mon, 28 Aug 2017 20:22:34 GMT
Content-Length: 56

{ "Status": "FOUND", "Description": "Eicar-Test-Signature" }

HTTPS

$ curl -i -k -F "file=@eicar.com.txt" https://localhost:9443/scan
HTTP/1.1 100 Continue

HTTP/1.1 406 Not Acceptable
Content-Type: application/json; charset=utf-8
Date: Mon, 28 Aug 2017 20:22:34 GMT
Content-Length: 56

{ "Status": "FOUND", "Description": "Eicar-Test-Signature" }

Test that service returns 200 for clean file:

HTTP

$ curl -i -F "file=@clamrest.go" http://localhost:9000/scan

HTTP/1.1 100 Continue

HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8
Date: Mon, 28 Aug 2017 20:23:16 GMT
Content-Length: 33

{ "Status": "OK", "Description": "" }

HTTPS

$ curl -i -k -F "file=@clamrest.go" https://localhost:9443/scan

HTTP/1.1 100 Continue

HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8
Date: Mon, 28 Aug 2017 20:23:16 GMT
Content-Length: 33

{ "Status": "OK", "Description": "" }

Status Codes

• 200 - clean file = no KNOWN infections
• 400 - ClamAV returned general error for file
• 406 - INFECTED
• 412 - unable to parse file
• 501 - unknown request

Configuration

Environment Variables

Below is the complete list of available options that can be used to customize your installation.

Parameter	Description
MAX_SCAN_SIZE	Amount of data scanned for each file - Default 100M
MAX_FILE_SIZE	Don't scan files larger than this size - Default 25M
MAX_RECURSION	How many nested archives to scan - Default 16
MAX_FILES	Number of files to scan withn archive - Default 10000
MAX_EMBEDDEDPE	Maximum file size for embedded PE - Default 10M
MAX_HTMLNORMALIZE	Maximum size of HTML to normalize - Default 10M
MAX_HTMLNOTAGS	Maximum size of Normlized HTML File to scan- Default 2M
MAX_SCRIPTNORMALIZE	Maximum size of a Script to normalize - Default 5M
MAX_ZIPTYPERCG	Maximum size of ZIP to reanalyze type recognition - Default 1M
MAX_PARTITIONS	How many partitions per Raw disk to scan - Default 50
MAX_ICONSPE	How many Icons in PE to scan - Default 100
PCRE_MATCHLIMIT	Maximum PCRE Match Calls - Default 100000
PCRE_RECMATCHLIMIT	Maximum Recursive Match Calls to PCRE - Default 2000
SIGNATURE_CHECKS	Check times per day for a new database signature. Must be between 1 and 50. - Default 2
PROXY_SERVER	Specify a proxy for freshclam to utilize, if applicable, set in environment variables - Optional
PROXY_PORT	The port for the proxy server, if applicable, set in environment variables - Optional
PROXY_USERNAME	The username for the proxy server, if applicable, set in environment variables - Optional
PROXY_PASSWORD	The password for the proxy server, if applicable, set in environment variables - Optional

Networking

Port	Description
3310	ClamD Listening Port

Maintenance / Monitoring

Shell Access

For debugging and maintenance purposes you may want access the containers shell.

docker exec -it (whatever your container name is e.g. clamav-rest) /bin/sh

Checking the version with the clamscan command requires to provide the custom database path. The default value is overwritten to /clamav/data in the /clamav/etc/clamd.conf, and the clamav service was started with this/clamav/etc/clamd.conf from the entrypoint.sh.

clamscan --database=/clamav/data --version

Prometheus

Prometheus metrics were implemented, which can be retrieved as follows

HTTP: curl http://localhost:9000/metrics

HTTPS: curl https://localhost:9443/metrics

Developing

Source Code can be found here: https://github.com/ajilach/clamav-rest

Build golang (linux) binary and docker image:

# env GOOS=linux GOARCH=amd64 go build
docker build . -t clamav-go-rest
docker run -p 9000:9000 -p 9443:9443 -itd --name clamav-rest clamav-go-rest

References

• https://www.clamav.net
• https://github.com/ajilach/clamav-rest