STunnel encrypts entire connections by using SSH over SSL or TLS, leveraging the OpenSSL library to implement the underlying TLS or SSL protocols. It is compatible with a wide range of operating systems, including most Unix-like systems and Windows.
SSH Over SSL/TLS (STunnel)
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An SSH Tunnel is a method of securely transmitting data over an unsecured network using the Secure Shell (SSH) protocol. It creates an encrypted connection (or tunnel) between a local machine and a remote server, allowing data to pass securely through that tunnel. SSH tunneling can be used to securely route traffic from different types of applications and services, such as web browsers, file transfer services, or email, ensuring that sensitive data remains encrypted and protected from eavesdropping or attacks.
How It Works:
1. Encryption: SSH tunnels encrypt the data transmitted between the client and the server, making it impossible for attackers to intercept or read the data while it’s in transit.
2. Port Forwarding: It uses a technique called port forwarding to redirect traffic from a specific local port to a remote server port, allowing secure access to services that may otherwise be inaccessible due to firewalls or other restrictions.
3. Secure Remote Access: SSH tunneling can be used to securely connect to remote servers or computers over the internet, making it ideal for managing remote servers, transferring files, or accessing private networks securely.
Common Uses:
Secure Access to Remote Systems: Admins use SSH tunnels to securely connect to remote systems to manage servers or transfer files.
Bypass Firewalls and Restrictions: Users can route traffic through an SSH tunnel to access restricted websites or services blocked by geographic or network-based restrictions.
Protect Data on Unsecured Networks: If you’re using a public Wi-Fi network, SSH tunnels can encrypt your data and protect it from potential hackers or malicious actors on the same network.
Types of SSH Tunneling:
1. Local Port Forwarding: Redirects traffic from a local port to a remote server, allowing access to services on the remote machine.
2. Remote Port Forwarding: Redirects traffic from a port on the remote server to a port on the local machine, useful for accessing services behind firewalls.
3. Dynamic Port Forwarding: Works like a SOCKS proxy, routing traffic for multiple services through the tunnel.