Записки программиста, обо всем и ни о чем. Но, наверное, больше профессионального.

2012-10-15

Reverse SSH Tunnels

До чего же мощный инструмент, этот SSH. Вот, к примеру, сидите вы дома, за роутером и файрволлом, пробиться снаружи на вашу машину нельзя. А хочется. Что делать? Сделать обратный туннель. Правда, для этого нужен «сервер» к которому можно подключаться по SSH.
С домашней машины устанавливаете соединение с сервером, сервер открывает порт и пробрасывает его обратно на вашу машину. Потом соединившись из любого места с сервером по этому порту вы попадаете на вашу домашнюю машину.

So the steps to create a reverse SSH tunnel are as follows:
From client machine: ssh -R remoteport:localhost:22 username@servername
ex: ssh -R 2048:localhost:22 bob@mylinuxserver.xxx
From server side (to re-establish the tunnel): ssh -p 2048 localhost


А вот, что говорит man ssh на эту тему

-R [bind_address:]port:host:hostport
Specifies that the given port on the remote (server) host is to be forwarded to the given host and port on the local side. This works by allocating a socket to listen to port on the remote side, and whenever a connection is made to this port, the connection is forwarded over the secure channel, and a connection is made to host port hostport from the local machine.

Port forwardings can also be specified in the configuration file. Privileged ports can be forwarded only when logging in as root on the remote machine. IPv6 addresses can be specified by enclosing the address in square braces or using an alternative syntax: [bind_address/]host/port/hostport.

By default, the listening socket on the server will be bound to the loopback interface only. This may be overridden by specifying a bind_address. An empty bind_address, or the address ‘*’, indicates that the remote socket should listen on all interfaces. Specifying a remote bind_address will only succeed if the server's GatewayPorts option is enabled (see sshd_config(5)).

If the port argument is ‘0’, the listen port will be dynamically allocated on the server and reported to the client at run time.

Интересно, в MS Windows по прежнему SSH демон в комплект не входит?

original post http://vasnake.blogspot.com/2012/10/reverse-ssh-tunnels.html

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