# GNU Health/Security
## Securing Your GNU Health Environment

Security is a multi disciplinary task, involving components from networking, operating system, database and application (Tryton), to human resources, to name a few.
This page will try to give an overview of some basic concepts that will help you to enhance the access control to your system. We will also talk about enabling Public-key cryptography to sign documents and records from different models.

## GNU Health Security Advisories

GNU Health releases Security Advisories (SA) anytime a vulnerability is found. The security advisory format is inspired on FreeBSD.
The GNU Health security advisories are sent to all subscribers in the "health-security" mailing list. See the "Resources" chapter to subscribe.
You can check the current security advisory list in https://ftp.gnu.org/gnu/health/security/security_advisories.html

## Access Control
### Default server Ports

The Tryton server JSON-RPC listens by default in port 8000. It's a advisable to change to another port in production environments.
The server super user encrypted password has been updated, in the corresponding section of the trytond.conf file. Here is a sample of such file

## Disable demo users in Production environments

GNU Health comes with a set of pre-defined users for demo purposes. They all have the suffix "demo_" ( demo_doctor, demo_front_desk, demo_nurse... ).
Please deactivate them in production environments.
To deactivate the users, follow the following path : Administration -> Users -> Users
In filters, you can choose : login name : demo_
Unset the "active" flag of each of them. The demo users are now de-activated in your environment.

## Public-key Cryptography in GNU Health
### GNU Health Cryptographic Module

The module goal is to achieve the concepts of confidentiality, integrity and non-repudiation in GNU Health.
The health_crypto module currently provides the following functionality:
* Document Serialization
* Document hashing (MD)
* Document signing
* Document verification
The module will work on records from models that will need this functionality such as prescription, patient evaluations, surgeries or lab tests.
The Serialization includes the information in a predefined format (JSON) and encoding (UTF8).
There will be a field that will contain the Message digest of the serialization process, and that will check for any changes. If the case of alteration of any fields
The signing process will be upon that Message Digest field, whereas the encryption process will work on row or column level.
Public-key / asymmetric cryptography will be used for signing the documents.
The standard models that are included are Prescription, Birth Certificate and Death Certificate. Of course, you can apply the functionality to any model that you feel like is necessary. In addition, and based on the community requests, we will incorporate new models in the next versions.

### Using Digital Signatures in GNU Health

GNU Health works along with GNU Privacy Guard for digitally signing and verifying documents. Please refer to the GNU Health Plugins section for the installation

## Reporting a security vulnerability

We take security very seriously, and we appreciate your help on this !
If you believe you have found a vulnerability in GNU Health, please send an email to security@gnuhealth.org
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