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Special Forums IP Networking Proxy Server WebSocket over SSH tunnel - is it possible? Post 302931498 by Vladislav on Tuesday 13th of January 2015 11:13:10 AM
Old 01-13-2015
The setup is quite simple actually - there is a WebSocket server and a WebSocket client connecting to it.

My idea is to be able to indirectly access the WebSocket server by forwarding it's listening port to a machine with a real IP address. (in the case when the server is behind a router or firewall and using standard NAT forwarding / routing is not an option - e.g. on two devices accessing the Internet through a mobile data connection)

The problem is that the WebSocket client will always allocate a random port when initializing the communication and the SSH-relay point has no idea how to handle the responses coming from the server on that port.

What makes it even worse is that SSH will open yet another TCP socket (again on a random port) which will be then used to forward the client's request to the actual WebSocket server over the SSH tunnel.
So, if I want to make this work I will have to build a second SSH tunnel from the WebSocket client, in an attempt to bridge the SSH generated client socket to the original one, which makes this a somewhat complicated task...
 

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plink(1)							 PuTTY tool suite							  plink(1)

NAME
plink - PuTTY link, command line network connection tool SYNOPSIS
plink [options] [user@]host [command] DESCRIPTION
plink is a network connection tool supporting several protocols. OPTIONS
The command-line options supported by plink are: -V Show version information and exit. -pgpfp Display the fingerprints of the PuTTY PGP Master Keys and exit, to aid in verifying new files released by the PuTTY team. -v Show verbose messages. -load session Load settings from saved session. -ssh Force use of SSH protocol (default). -telnet Force use of Telnet protocol. -rlogin Force use of rlogin protocol. -raw Force raw mode. -serial Force serial mode. -P port Connect to port port. -l user Set remote username to user. -m path Read remote command(s) from local file path. -batch Disable interactive prompts. -pw password Set remote password to password. CAUTION: this will likely make the password visible to other users of the local machine (via com- mands such as `w'). -L [srcaddr:]srcport:desthost:destport Set up a local port forwarding: listen on srcport (or srcaddr:srcport if specified), and forward any connections over the SSH con- nection to the destination address desthost:destport. Only works in SSH. -R [srcaddr:]srcport:desthost:destport Set up a remote port forwarding: ask the SSH server to listen on srcport (or srcaddr:srcport if specified), and to forward any con- nections back over the SSH connection where the client will pass them on to the destination address desthost:destport. Only works in SSH. -D [srcaddr:]srcport Set up dynamic port forwarding. The client listens on srcport (or srcaddr:srcport if specified), and implements a SOCKS server. So you can point SOCKS-aware applications at this port and they will automatically use the SSH connection to tunnel all their connec- tions. Only works in SSH. -X Enable X11 forwarding. -x Disable X11 forwarding (default). -A Enable agent forwarding. -a Disable agent forwarding (default). -t Enable pty allocation (default if a command is NOT specified). -T Disable pty allocation (default if a command is specified). -1 Force use of SSH protocol version 1. -2 Force use of SSH protocol version 2. -C Enable SSH compression. -i path Private key file for authentication. -s Remote command is SSH subsystem (SSH-2 only). -N Don't start a remote command or shell at all (SSH-2 only). -sercfg configuration-string Specify the configuration parameters for the serial port, in -serial mode. configuration-string should be a comma-separated list of configuration parameters as follows: o Any single digit from 5 to 9 sets the number of data bits. o `1', `1.5' or `2' sets the number of stop bits. o Any other numeric string is interpreted as a baud rate. o A single lower-case letter specifies the parity: `n' for none, `o' for odd, `e' for even, `m' for mark and `s' for space. o A single upper-case letter specifies the flow control: `N' for none, `X' for XON/XOFF, `R' for RTS/CTS and `D' for DSR/DTR. MORE INFORMATION
For more information on plink, it's probably best to go and look at the manual on the PuTTY web page: http://www.chiark.greenend.org.uk/~sgtatham/putty/ BUGS
This man page isn't terribly complete. See the above web link for better documentation. PuTTY tool suite 2004-03-24 plink(1)
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