OpenVPN: привязка IP клиента к CN его сертификата (IP to Certificate binding)

Зачастую требуется, чтобы удаленные клиенты, подключаясь к VPN-серверу (будь то openvpn, IPSec или что-то еще) постоянно получали одни и те же адреса внутри туннеля. Такая потребность возникает когда нужно обеспечить непрерывный мониторинг клиентских ПК, если эти клиентские ПК, например, являются платежными терминалами, с установленными Windows Embedded.  Благодаря подобной привязке можно в том же Nagios указать, что 10.10.220.10 — это адрес платежного терминала расположенного по адресу Пушкинская, д.20, а 10.10.220.15 — терминала, расположенного на Некрасова, д.14.

Итак, в OpenVPN за назначение адресов клиентам, равно как и самому серверу, отвечает следующая строчка файла server.conf:

server 10.10.220.0 255.255.255.0

Так, сервер получит первый адрес подсети, 10.10.220.1, а клиенты — свободные адреса из пула. При использовании tun-интерфейса клиенты будут получать адреса 10.10.220.4, 10.200.220.8, 10.200.220.12 и т.д.

Нужно, чтобы Клиент_1 всегда получал адрес 10.10.220.12, а Клиент_2 всегда получал адрес 10.10.220.16. Для этого в server.conf OpenVPN есть/должна быть такая строчка:

ifconfig-pool-persist ipp.txt

Она указывает, что прежде чем раздавать клиентам свободные адреса из пула, сервер должен заглянуть в файл ipp.txt и посмотреть, нет ли для того или иного клиента привязки его имени к IP-адресу. Если такая привязка есть — нужно взять адрес из этого (ipp.txt) файла и назначить его клиенту.

Так как взаимная аутентификация сервера и клиента осуществляется по 802.1x серификатам, целесообразно привязывать IP адрес к сертификату. Для привязки сертификата берется атрибут CN (common name) поля Subject сертификата клиента. Т.е., если в сертификате клиента  поле Subject выглядит так:

E = admin@sommail.ru
CN =Client_01
OU = somedep
O = SomeOrg Inc.
L = Saint-Petersburg
C = RU

то запись для Клиента_1 в файле ipp.txt будет выглядеть так: Client_01,10.10.220.12

Соответственно, весь файл для обозначенной задачи будет содержать две строчки:

Client_01,10.10.220.12
Client_01,10.10.220.16

На самом деле, в данном случае, т.к. клиенты представляют собой терминалы на Windows Embedded и используется технология net30, они (клиенты) получат в последнем октете не 12 и 16, а 14 и 18 соответственно, но на практике это не принципиально, т.к. важно то, что (14 и 18) адреса клиенты будут получать постоянно.

P.S. OpenVPN сервер по дефолту сам сохраняет IP подключающихся клиентов в файл ipp.txt (или как он у вас называется), при настройке мониторинга, можно просто посмотреть в этот файл и забрать данные оттуда, ничего самостоятельно не туда не добавляя.


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23 comments on “OpenVPN: привязка IP клиента к CN его сертификата (IP to Certificate binding)
  1. Дмитрий:

    Скажите, а если у меня 1 сертификат безопасности на всех, как быть?

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  3. Для обеспечения доступа к сетям клиента, задаем маршруты к этим сетям. Заданные здесь маршруты будут добавлены к системным маршрутам. В режиме сервера, необходимо также задать внутренние маршруты параметром iroute в файле конфигурации клиента.

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    However, in today’s world a woman no longer needs to look at an image that has been edited by the mainstream media in order to be deceived; they only need to use social media. This is because people are now editing their pictures in the same way that the media edits pictures.
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    Nevertheless, regardless of whether someone is editing their pictures or not, they are still being exposed to images that don’t reflect reality. And even if they don’t consciously think about what is taking place, it can still effect them at a deeper level.
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    Further To Fall
    The more one edits their pictures on social media, the harder it is going to be for them to accept themselves. This is because their appearance is always going to fall short when they compare it to the images that they have edited.
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