Connecting to openvpn linux

OpenVPN 3 Client for Linux

Background

The OpenVPN 3 Linux project is a new client built on top of the OpenVPN 3 Core Library, which is also used in the various OpenVPN Connect clients and OpenVPN for Android (need to be enabled via the settings page in the app).

This client is built around a completely different architecture in regards to usage. It builds heavily on D-Bus and allows unprivileged users to start and manage their own VPN tunnels out-of-the-box. System administrators wanting more control can also control and restrict this access both by hardening the default OpenVPN 3 D-Bus policy or facilitating features in OpenVPN 3 Linux.

Even though the project name carries “Linux”, it doesn’t mean it is restricted to Linux only. Any platform which has D-Bus available should be capable of running this client in theory. But since D-Bus is most commonly used in Linux environments, this will naturally be the primary focus for the project.

The release notes are stored in git tags in the project git repository. They can also be viewed here: https://github.com/OpenVPN/openvpn3-linux/releases (expand the tag to see the full text)

Installation as Connector for OpenVPN Cloud

Installation of OpenVPN 3 client as a Connector for OpenVPN Cloud Host or Network has been simplified and documented here.

Installation for Debian and Ubuntu

Follow these steps in order to install OpenVPN 3 Client on Linux for Debian and Ubuntu:

Open the Terminal by pressing ctrl + alt + T

Type the following command into the Terminal: sudo apt install apt-transport-https . This is done to ensure that your apt supports the https transport. Enter the root password as prompted

Type the following command into the Terminal: sudo wget https://swupdate.openvpn.net/repos/openvpn-repo-pkg-key.pub . This will install the OpenVPN repository key used by the OpenVPN 3 Linux packages

Type the following command into the Terminal: sudo apt-key add openvpn-repo-pkg-key.pub

Type the following command into the Terminal: sudo wget -O /etc/apt/sources.list.d/openvpn3.list https://swupdate.openvpn.net/community/openvpn3/repos/openvpn3-$DISTRO.list . This will install the proper repository. Replace $DISTRO with the release name depending on your Debian/Ubuntu distribution (the table of release names for each distribution can be found below). In this case, focal is chosen since Ubuntu 20.04 is used

Type the following command into the Terminal: sudo apt update

Type the following command into the Terminal: sudo apt install openvpn3 . This will finally install the OpenVPN 3 package

Distribution	Release	Release name ($DISTRO)
Debian	9	stretch
Debian	10	buster
Ubuntu	16.04	xenial
Ubuntu	18.04	bionic
Ubuntu	19.10	eoan
Ubuntu	20.04	focal

Installation for Fedora, Red Hat Enterprise Linux, CentOS, or Scientific Linux

Packages for these distributions are provided via a Fedora Copr repository. Supported versions:

Distribution	Release versions
Fedora	30, 31, 32
Red Hat Enterprise Linux / CentOS	7, 8

In order to install the OpenVPN 3 Client for Fedora, Red Hat Enterprise Linux, CentOS, or Scientific Linux, follow the steps below:

1. Open Terminal by typing terminal into the search bar
2. If you are running Red Hat Enterprise Linux or its clones, you need to install the Fedora EPEL repository first. Here is the list of commands for each version:
   (The original article on Fedora EPEL can be found here)
   RHEL/CentOS 6: sudo yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm
   RHEL/CentOS 7: sudo yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
   On RHEL 7 it is recommended to also enable the optional, extras, and HA repositories since EPEL packages may depend on packages from these repositories: sudo subscription-manager repos —enable «rhel-*-optional-rpms» —enable «rhel-*-extras-rpms» —enable «rhel-ha-for-rhel-*-server-rpms»
   RHEL/CentOS 8: sudo yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
   On RHEL 8 it is required to also enable the codeready-builder-for-rhel-8-$-rpms repository since EPEL packages may depend on packages from it: sudo ARCH=$( /bin/arch ) followed by sudo subscription-manager repos —enable «codeready-builder-for-rhel-8-$-rpms»
   On CentOS 8 it is recommended to also enable the PowerTools repository since EPEL packages may depend on packages from it: sudo dnf config-manager —set-enabled PowerTools
3. You need to install the yum copr module first by running the following command: sudo yum install yum-plugin-copr . Note: Fedora releases usually have the yum/dnf copr module preinstalled.
4. With the Copr module available, it is time to enable the OpenVPN 3 Copr repository by running the following command: sudo yum copr enable dsommers/openvpn3
5. Finally, the OpenVPN 3 Linux client can be installed by running the following command: sudo yum install openvpn3-client

Using .ovpn Profile

Please note that by this point you should have downloaded a .ovpn profile to your machine.

Mandatory Commands

In order to start a one-shot configuration profile, type the following command into the Terminal: openvpn3 session-start —config $. Important: a «one-shot configuration profile» means that the configuration file is parsed, loaded, and deleted from the configuration manager as soon as the VPN session has been attempted started. No configuration file is available for re-use after this approach. This is achieved by giving the configuration file to the openvpn3 session-start command directly.

In order to import a configuration file for re-use and start a VPN session, type the following command into the Terminal: openvpn3 config-import —config $ . Note: using this approach, an imported configuration file can be used several times, and access to the configuration file itself is not needed to start VPN tunnels. By default, configuration profiles imported are only available to the user who imported the configuration file. But OpenVPN 3 Linux also provides an Access Control List feature via openvpn3 config-acl to grant access to specific or all users on the system. Important: this loads the configuration profile and stores it in memory-only. That means, if the system is rebooted, the configuration profile is not preserved. If the –persistent argument is added to the command line above, the configuration profile will be saved to disk in a directory only accessible by the OpenVPN user. Whenever the Configuration Manager is started, configuration files imported with –persistent will be automatically loaded as well.

In order to start a new VPN session from an imported configuration profile, run the following command: openvpn3 session-start —config $ . Note: When a configuration profile is available via openvpn3 configs-list, it can easily be started via openvpn3 session-start using the configuration profile name (typically the filename used during the import)

Optional Commands

1. To list all available configuration profiles, run this command: openvpn3 configs-list . Important: a configuration file typically contains generic options to be able to connect to a specific server, regardless of the device itself. OpenVPN 3 Linux also supports setting more host-specific settings on a configuration profile as well. This is handled via the `openvpn3 config-manage` interface. Any settings here will also be preserved across boots if the configuration profile was imported with the —persistent argument.
2. Note that it is possible to use the D-Bus path to the configuration profile: openvpn3 session-start —config-path /net/openvpn/v3/configuration/. . Note: in either of these cases is it necessary to have access to the configuration profile on disk. As long as configuration profiles are available via openvpn3 configs-list , all needed to start a VPN session should be present.

Managing a Running Session

1. Once a VPN session has started, it should be seen in the session list: openvpn3 sessions-list
2. Using the openvpn3 session-manage there are a few things which can be done, but most typically it is the –disconnect or –restart alternatives which are most commonly used. openvpn3 session-manage —config $ —restart . This disconnects and re-connects to the server again, re-establishing the connection. The $ is the configuration name as displayed in openvpn3 sessions-list
3. It is also possible to use the D-Bus path to the session as well: openvpn3 session-manage —session-path /net/openvpn/v3/sessions/. —disconnect . This command above will disconnect a running session. Once this operation has completed, it will be removed from the openvpn3 sessions-list overview. Important: you will be able to start a new session with this or another OpenVPN profile only after you have disconnected from the current session using the command in this step
4. It is also possible to retrieve real-time tunnel statistics from running sessions: openvpn3 session-stats —config $ or openvpn3 session-stats —session-path /net/openvpn/v3/sessions/.
5. And to retrieve real-time log events as they occur, run the following command: openvpn3 log —config $. This might be quite silent, as it does not provide any log events from the past. Issue an openvpn3 session-manage –restart from a different terminal, and log events will occur. You may want to boost the log-level with –log-level 6. Valid log levels are from 0 to 6, where 6 is the most verbose. Note: VPN sessions are also owned by the user which started it. But the Session Manager also provides its own Access Control List feature via openvpn3 session-acl

Changing the OpenVPN Profile of an Autoloading VPN Session

Please note that every time you start a session, it will load automatically on the system start-up. In order to change the profile of an OpenVPN Session that is autoloaded, follow the steps below:

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Простая настройка OpenVPN Linux

OpenVPN часто используется для создания виртуальных безопасных сетей между компьютерами, которые находятся на очень большом расстоянии, но при этом между ними нужно получить шифрованное безопасное соединение, которое невозможно перехватить и прослушать.

Другое применение для OpenVPN — это обход блокировок различных интернет ресурсов. Существуют различные серверы OpenVPN серверы в интернете, но будет намного надежнее если развернуть OpenVPN на своем сервере. Мы рассматривали процесс в статье установка OpenVPN на Ubuntu, но для новичков это достаточно сложно. В этой инструкции мы рассмотрим как выполняется настройка OpenVPN linux с помощью скрипта openvpn-install, который упрощает процесс установки и настройки в несколько раз. С его помощью вы получите работающий сервер в течение нескольких минут.

Настройка OpenVPN сервера в Linux

В этой статье, в качестве системы для примера мы будем использовать операционную систему CentOS, но операции не будут отличаться в других дистрибутивах. Сначала скачайте сам скрипт:

wget https://git.io/vpn -O openvpn-install.sh

Затем запустите скрипт от имени суперпользователя с помощью такой команды:

Дальше скрипт задаст несколько вопросов по настройкам OpenVPN. Сначала нужно указать точный ip адрес VPS, на котором будет запущен OpenVPN, именно на этом адресе программа будет слушать соединения:

Затем выберите протокол, который вы хотите использовать. Например, если я хочу использовать TCP то нужно выбрать 2:

Затем введите номер порта, на котором будет слушать программа, можно оставить значение по умолчанию:

Выберите сервера DNS, которые нужно использовать, мне, например, нравятся сервера от Google:

Введите имя клиента, для которого будут подписаны сертификаты на доступ:

Дальше нажмите Enter, и подтвердите установку OpenVPN. Программа сама установит нужные пакеты в вашем дистрибутиве, а затем подпишет все необходимые сертификаты, запустит сервер openvpn и даже добавит его в автозагрузку systemd:

Последний шаг, это утилита спросит есть ли у вашего сервера дополнительный внешний ip адрес. Это может быть полезно, если вы используете NAT, и для доступа к серверу применяете какой-либо туннель. В других случаях этот пункт можно пропустить, для VPS точно пропускаем.

Теперь установка и настройка OpenVPN сервера Linux завершена. Конфигурационный файл для клиента сохранен по адресу /root/sergiy-pc.ovpn, может иметь и другое имя, в зависимости от того, какое имя вы дали клиенту. Самое интересное, что для того чтобы добавить новых клиентов, вам просто достаточно запустить скрипт еще раз. Осталось только скопировать полученный файл клиенту, для этого можно на клиентском компьютере выполнить scp:

scp root@адрес_сервера:/root/sergiy-pc.ovpn /etc/openvpn/

Настройка клиента OpenVPN

Вы можете настроить OpenVPN на клиентской машине как захотите, например, с помощью NetworkManager. Но мы рассмотрим ручной вариант. Сначала установите саму программу. Установка OpenVPN Linux Ubuntu выполняется командой:

sudo apt install openvpn

sudo yum install openvpn

Теперь для подключения к нашему серверу используем полученный файл:

openvpn —config /etc/openvpn/client.ovpn

Вы можете использовать команду ip addr чтобы проверить ip адрес интерфейса OpenVPN — tun0:

Как видите, OpenVPN автоматически выдал IP вашему компьютеру, теперь можете проверить подключение к этому серверу с помощью ping:

Вот и все, ваша сеть готова к работе.

Выводы

Пять минут и настройка OpenVPN Linux завершена, а не подключение следующего клиента уйдет еще меньше. Этот метод не специфичен для RPM систем и может использоваться также в DEB системах, таких как Ubuntu или Debian. Если у вас остались вопросы, спрашивайте в комментариях!

Полная настройка OpenVPN:

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