setup_ssh_multiport

A Bash script that installs and configures OpenSSH with support for multiple SSH ports.

It compiles OpenSSh from source, modifies the MAX_LISTEN_SOCKS limit, creates a new systemd service (sshnew), and automatically opens a user-defined number of SSH ports.

---

Features

• Installs OpenSSH 8.6p1 from source.
• Modifes MAX_LISTEN_SOCKS to support multiple listening ports.
• Creates a dedicated systemd service (sshnew) separate from the default ssh.
• Automatically generates a configuration with random SSH ports.
• Provides helper script openports.sh for regenerating port configuration.
• Validates SSH configuration before starting the service.
• Supports root login and password authentication by default (customizable).

---

Requirements

• Debian/Ubuntu-based system (APT package manager).
• Root privileges (sudo).
• Internet connection (to download OpenSSH sources).

---

Installation

Clone the repository and run the script:

git clone https://github.com/Hanashiko/setup-ssh-multiport.git
cd setup-ssh-multiport
chmod +x setup_ssh_multiport.sh 
sudo ./setup_ssh_multiport.sh 

---

Configuration Steps

During installation, the script will prompt you for:

1. Number of SSH ports to open (default: 30).
2. Port range (min and max, defaults: 2000-65000).
3. Confirmation before proceeding with compilation and setup.

---

Service Information

After installation, a new SSH service will be available:

• Service name: sshnew
• Main config file: /opt/openssh-9.6p1/etc/sshd_config
• Ports configuration: /opt/openssh-9.6p1/etc/sshd_config.d/70-ports.conf
• Port regeneration script: /opt/openssh-9.6p1/openports.sh

---

Useful Commands:

View opened ports:

cat /opt/openssh-9.6p1/etc/sshd_config.d/70-ports.conf

Regenerate ports:

bash /opt/openssh-9.6p1/openports.sh

Check service status:

systemctl status sshnew 

Restart service:

systemctl restart sshnew

View logs:

journalctl -u sshnew -f

---

Example Output

After installation, you'll see a summary like:

┌─────────────────────────────────────┐
│            OPEN PORTS               │
├─────────────────────────────────────┤
│ 1.  SSH Port: 22                    │
│ 2.  SSH Port: 23456                 │
│ 3.  SSH Port: 34567                 │
│ ...                                 │
├─────────────────────────────────────┤
│ Total ports: 30                     │
└─────────────────────────────────────┘

---

Security Notes

• By default, the script enabes root login and password authentication. You should adjuct /opt/openssh-9.6p1/etc/sshd_config for production security.
• Make sure your fiewall (UFW/iptables/Firewalld/SELinux) is configred to allow the newly opened ports.
• Keep OpenSSH updated to avoid security vulnerablities.

---

Uninstall / Cleanup

To remove the custom OpenSSH installation:

systemctl stop sshnew
systemctl disable sshnew
rm -rf /opt/openssh-9.6p1
rm -f /lib/systemd/system/sshnew.service
systemctl daemon-reload

---

License

This project is released under the MIT License.