- You can proxy to anywhere (see the Proxy directive in Apache) based on names
- You can proxy to any port you like (see the AllowCONNECT directive in Apache)
- It works even when there is a layer-7 protocol firewall
- If you enable proxytunnel ssl support, it is indistinguishable from real SSL traffic
- You can come up with nice hostnames like 'downloads.yourdomain.com' and 'pictures.yourdomain.com' and for normal users these will look like normal websites when visited.
- There are many possibilities for doing authentication further along the path
- You can do proxy-bouncing to the n-th degree to mask where you're coming from or going to (however this requires more changes to proxytunnel, currently I only added support for one remote proxy)
- You do not have to dedicate an IP-address for sshd, you can still run an HTTPS site
- An internet connected Apache server (eg. with IP address 10.1.2.3)
- A FQDN that points to this IP address (eg. ssh.yourdomain.com)
- A virtual host configuration in Apache for this domain (eg. /etc/httpd/conf.d/ssh.yourdomain.com.conf)
- A configuration to adapt ssh to use the HTTP tunnel
<VirtualHost 10.1.2.3> DocumentRoot /var/www/html Customlog ssh.yourdomain.com-access.log combined ErrorLog ssh.yourdomain.com-error.log HostnameLookups On ProxyRequests on AllowCONNECT 22 2022 ProxyVia on ### Deny everything by default <Proxy *> Order deny,allow Deny from all </proxy> # <Proxy 18.104.22.168> # <Proxy machine.yourdomain.com> # <ProxyMatch .*\.yourdomain\.com> <ProxyMatch (machine1|machine2)\.yourdomain\.com> Order deny,allow Deny from all ### External (customer) sites allowed to connect Allow from 194-78-234-211.dialup.skynet.be Allow from 114-149.241.81.adsl.skynet.be </ProxyMatch> </VirtualHost>proxytunnel 1.6.0. It includes a patch I wrote to chain 2 HTTP proxies. (RPM packages)
Then add something similar to this to you ~/.ssh/config file.
Host *.yourdomain.com *.otherdomain.net someserver.org DynamicForward 1080 ProxyCommand proxytunnel -v -p proxy.local.net:8080 -r ssh.yourdomain.com:443 -d %h:%p -H "User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Win32)\n" ServerAliveInterval 30This will make SSH use the proxytunnel utility to tunnel SSH over HTTP(S). After that you can simply do:
[user@localhost ~]$ ssh machine1.yourdomain.com Connected to proxy.local.net:8080 Tunneling to ssh.yourdomain.com:443 (destination) Starting tunnel email@example.com's password:proxytunnel 1.6.0. (For Windows take the cygwin build) It includes the patch I wrote to chain 2 HTTP proxies. (RPM packages)
Then to configure putty to use proxytunnel, you need a recent putty (newer than 0.58). Currently only the development release includes the required functionality.
Then go into the Connection > Proxy menu. Select the Local proxy type. And then provide as Telnet command, or local proxy command the following line:
proxytunnel -q -p proxy.local.net:8080 -r ssh.yourdomain.com:443 -d %host:%port -H "User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Win32)\n"For Windows it helps to put the proxytunnel.exe in the same path as putty so that putty can find proxytunnel.exe more easily.
For debugging you can replace the -q option with a -v option and use the command on the command-line. proxytunnel will print what it is doing and where it fails.
To simplify tunneling over SSH, you might want to create a 'dynamic' tunnel using the -D 1080 OpenSSH option. This allows you to socksify any TCP connection and direct it over the SSH tunnel dynamicly.
Most browers allow to socksify their own stack by simplying configuring a socks proxy. In this case you should point your browser to localhost:1080 to surf using the SSH tunnel.http://issues.apache.org/bugzilla/show_bug.cgi?id=29744 https://lists.sourceforge.net/lists/listinfo/proxytunnel-users
- Use SSL for forwarding requests
- Allow to chain more than 2 proxies
- Allow authentication on the second proxy (so that a fixed ACL is not required and you have much more flexibility)