3/16/2024 0 Comments Vpn gate openvpn![]() Of course, all of this can be streamlined for our users. This configuration is safe to distribute to all users who need to connect via OpenVPN because it does not include any user-specific information. Here, the vpnconfig_cert.ovpn file is automatically generated by clicking the Download VPN client button in Azure VPN Gateway's P2S configuration area. With our user certificate verified, we can now use it to connect to Azure VPN Gateway using the OpenVPN CLI: sudo openvpn -config vpnconfig_cert.ovpn -cert ismailzai.crt -key ismailzai.key X509v3 Subject Alternative Extended Key Usage: criticalĭigital Signature, Non Repudiation, Key Encipherment Keyid:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX ![]() ![]() The output will include a section like this: X509v3 extensions: The command above ensures that all the necessary extensions are attached to the signed certificate, which we can validate using OpenSSL: openssl x509 -in ismailzai.crt -text Frustratingly, there is a bug in OpenSSL that strips extensions from the CSR, so we have to append them when generating the final certificate. Specifically, we need to specify the subject alternative name (SAN) and the necessary key usages. The gotcha here is that if the certificate does not have the correct extensions associated with it, Azure VPN Gateway will kill our connection. The command above also generates a private key, which the user uses to communicate with the VPN.Īll that is left is to generate a client authentication certificate using the CSR: openssl x509 -req -days 365 \ Now, each user generates a CSR using their AAD id as the common name: openssl req -new \ Once we've done this, any valid certificate signed by this one will be allowed access to the VPN. Next, we upload this certificate to the Azure VPN Gateway's P2S configuration area. subj "/C=CA/ST=BC/L=Vancouver/O=Ismailzai VPN/OU=IT/CN=Ismailzai VPN" \ We'll start by generating a CA key and certificate: openssl req -x509 -new -sha256 \
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