# Renewal of VPN certificate

If you have issues connecting to the VPN and you see the error:
```
Certificate has key usage  00a0, expects 00a0
```
in `/var/log/openvpn-client.log`, then your certificate has probably expired.

To check its expiry date, as `root` type the command:
```sh
$ openssl x509 -in /etc/openvpn/keys/user.crt -noout -enddate
notAfter=Nov 12 13:42:43 2018 GMT
```
The displayed date after `noAfter` is the expiry date.

There are four methods to renew the certificate.

## 1. Neutrinet app

The [[en:cube:apps-neutrinet|Neutrinet app]] takes care of checking every night whether certificates must be renewed.

### Install

You can either install the app through the admin panel, or with:
```sh
yunohost app install neutrinet
```

### Upgrade

To upgrade this app:
```sh
yunohost tools update --apps
yunohost tools upgrade --apps neutrinet
```

## 2. From a cube

If the Neutrinet app is already installed, you can force the certificates verification:
```sh
cd /opt/neutrinet/renew_cert
./renew_cert_cron.sh -v
```

## 3. From the renew_cert script

Clone the following git repository, either on your cube or your own computer:
```sh
git clone https://git.domainepublic.net/Neutrinet/renew_cert
```

Move to the folder that just has been created:
```sh
cd renew_cert
```

Create a virtual python3 environment. This means that the installed python3 packages won't have any impact on the rest of the system:
```sh
python3 -m venv ve
```

Enable this environment:
```sh
source ve/bin/activate
```

Install the script dependencies:
```
pip install -r requirements.txt
```

Finally, run the script with this command:
```
python renew.py <Neutrinet VPN's username>
```

You will be asked for your password to login to the Neutrinet VPN.

Normaly, a subfolder named `certs_YYYY-MM-DD_HH:MM:SS` (replace the uppercase letters with the script execution date and time ) should be created, which contains all the configuration files needed for the OpenVPN client.

The files that we need are `client.crt` and `client.key`, i.e. the public and private key of the certificate.

These files must replace the files in `/etc/openvpn` (this may change depending of the OS).
On the cube, these files are in `/etc/openvpn/keys`

**Remark**: Before replacing one with the other, it is advisable to make a backup of the old certificate, just in case. For instance, with the following commands (still from the `renew_cert` directory):
```sh
sudo mv /etc/openvpn/keys/user.crt{,.backup}
sudo mv /etc/openvpn/keys/user.key{,.backup}
sudo mv client.crt /etc/openvpn/keys/user.crt
sudo mv client.key /etc/openvpn/keys/user.key
```

All you need to do is to restart the OpenVPN service to check if it's still working.

**Remark**: Ideally, make sure to be connected on the same local network as your cube, i.e. through its local address (192.168.1.x in most cases).
```sh
sudo systemctl restart openvpn`
```

To check that you are connected to the VPN, you can run the following command:
```sh
ip addr
```

Normaly, the `tun0` interface should appear in the list.

## 4. From user.neutrinet.be

This method sometimes requires some patience because user.neutrinet.be can produce some failures.

Login with ssh to your internet cube, then go to the folder where the VPN key is located (it should be the file `/etc/openvpn/keys/user.key`):
```sh
cd /etc/openvpn/keys
```

Create a certificate signing request (CSR) for this key:
```sh
openssl req -new -newkey rsa:4096 -nodes -keyout user.key
```

You will be asked for several questions, such as the country code (BE), the region (Bruxelles, ...), the organisation, etc... to which the certificate is related.
Most important is the `Cname`, that is the name which will be used by Neutrinet to know to whom belongs the certificate.

**Remark**: It is recommanded to provide your email address for the Cname field.

This command create a file named `client.csr`, which contains the certificate signing request. You can display its content with:
```sh
cat client.csr
```

Copy this content, then go to https://user.neutrinet.be

{{ :fr:vpn:renew_cert-01-login.png?direct&600 |}}

Login

{{ :fr:vpn:renew_cert-02-dashboard.png?direct&600 |}}

Click on `Users`

{{ :fr:vpn:renew_cert-03-users.png?direct&600 |}}

Wait for the page to load, and when you see your name click on it.

{{ :fr:vpn:renew_cert-04-user.png?direct&600 |}}

Click on `View associated clients`

{{ :fr:vpn:renew_cert-05-clients.png?direct&600 |}}

Click on your certificate (if you have more than one, use the one with an IPv4 - 80.67.181.x)

{{ :fr:vpn:renew_cert-06-client.png?direct&600 |}}

Choose the `Renew certificate` option

{{ :fr:vpn:renew_cert-07-certificate.png?direct&600 |}}

The current certificate should appear on the screen. Click on `Rekey`, then paste the content of the CSR (the file you copied earlier).

Click on the `Rekey` button to confirm.

Once this operation done, you should see the following banner:

{{ :fr:vpn:renew_cert-08-rekey.png?direct&600 |}}

You can click on `View client details`, then on `Download config package`.

This will download a zip file containing the certificate files. In the directory `/etc/openvpn/keys` of your cube, copy the file `client.crt` to `/etc/openvpn/keys/user.crt`.

That's it!