Creating custom WPK packages

1. Get a X509 certificate and CA

Create root CA

# openssl req -x509 -new -nodes -newkey rsa:2048 -keyout wpk_root.key -out wpk_root.pem -batch

Create certificate and key

# openssl req -new -nodes -newkey rsa:2048 -keyout wpkcert.key -out wpkcert.csr -subj '/C=US/ST=CA/O=Wazuh'
  • /C=US is the country.

  • /ST=CA is the state.

  • /O=Wazuh is the organization’s name.

Sign this certificate with the root CA:

# openssl x509 -req -days 365 -in wpkcert.csr -CA wpk_root.pem -CAkey wpk_root.key -out wpkcert.pem -CAcreateserial

2. Compile a package

WPK packages will usually contain a complete agent code, but this is not necessary.

A WPK package must contain an installation program, in binary form or a script in any language supported by the agent (Bash, Python, etc). Canonical WPK packages should contain a Bash script with name for UNIX or upgrade.bat for Windows. This program must:

  • Fork itself, the parent will return 0 immediately.

  • Restart the agent.

  • Before exiting, the installer must write a file called upgrade_result containing a status number (0 means OK). For instance: 0


  • Python 2.7 or 3.5+

  • Cryptography package for Python. You may get the Cryptography package using Pip:

pip install cryptography

Canonical WPK package example

  1. Download sources from GitHub at branch 3.0:

# curl -Lo && unzip

2. Modify the wazuh-3.0/etc/preload-vars.conf file from downloaded sources to deploy an unattended update in the agent. It has to be uncommented the following lines.

  1. Compile the project:

# make -C wazuh-3.0/src TARGET=agent
  1. Change to the base directory:

# cd wazuh-3.0
  1. Install the root CA, only if you want to overwrite the root CA with the file you created before:

# cp path/to/wpk_root.pem etc/wpk_root.pem
  1. Compile the WPK package. You need your SSL certificate and key:

# contrib/agent-upgrade/ output/myagent.wpk path/to/wpkcert.pem path/to/wpkcert.key *
  • output/myagent.wpk is the name of the output WPK package.

  • path/to/wpkcert.pem is the path to your SSL certificate.

  • path/to/wpkcert.key is the path to your SSL certificate’s key.

  • * is the file (or the files) to be included into the WPK package.

In this particular case, the Wazuh Project’s root directory contains the proper file.


This is a mere example. If you want to distribute a WPK package this way you should first clean the directory.