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Using the Prox圜ommand option to invoke Netcat as the last in the chain is a variation of this for very old clients.
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But this method cannot be used if the intermediate hosts deny port forwarding. So the traffic passing through the intermediate hosts is always encrypted. In addition to whatever other encryption goes on, the end points of the chain encrypt and decrypt each other's traffic. This is the most secure method because encryption is end-to-end. The main method is to use an SSH connection to forward the SSH protocol through one or more jump hosts, using the ProxyJump directive, to an SSH server running on the target destination host. It is possible to connect to another host via one or more intermediaries so that the client can act as if the connection were direct. Jump Hosts - Passing Through a Gateway or Two
SSH PROXY TO PROTECT OLD SSH SERVERS INSTALL
Install nmap-ncat if it’s not already installed: $ sudo dnf install nmap-ncat -y To connect to a server via ssh through a proxy server we’ll be using netcat. $ sudo firewall-cmd -reload Testing the ssh proxy connection Configure firewalld to allow for this: $ sudo firewall-cmd -add-service=squid -perm Now enable and restart the squid proxy service: $ sudo systemctl enable squidĤ.) By default squid proxy listens on port 3128. Next, add the SSH port as a safe port by adding the following line: acl Safe_ports port 22 For example, if your local IP network range is 192.168.1.X, this is how the line would look: acl localnet src 192.168.1.0/24 The default configuration file already has a list of the most common ones but you will need to add yours if it’s not there. Squid uses access control lists to manage connections.Įdit the /etc/squid/nf file to make sure you have the two lines explained below.įirst, specify your local IP network.
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The squid configuration file is quite extensive but there are only a few things we need to configure.
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Install the squid package using sudo: $ sudo dnf install squid -y However for this setup you’ll configure Squid to be used as an SSH proxy server since it’s a robust trusted proxy server that is easy to configure. It’s normally used to help improve response times and reduce network bandwidth by reusing and caching previously requested web pages during browsing. Squid is a full-featured proxy server application that provides caching and proxy services. In these cases connecting to another SSH server via a proxy server is one way to get through. Other times, you may want to add an extra layer of security to your SSH connection. Sometimes you can’t connect to an SSH server from your current location.