Denyhosts
DenyHosts is an open-source program designed to help system administrators thwart SSH server attacks by blocking IP addresses using failed authentication attempts to detect attackers. It adds IP addresses to the system's /etc/hosts.deny file when it identifies too many faile
DenyHosts: Open-Source Anti-DDoS Solution
DenyHosts helps system administrators thwart SSH server attacks by blocking IP addresses using failed authentication attempts, adding them to the /etc/hosts.deny file.
What is Denyhosts?
DenyHosts is an open-source program created in Python that helps system administrators prevent dictionary and brute force SSH attacks by analyzing SSH server log files to identify IP addresses that are performing multiple failed login attempts. When DenyHosts detects an IP address that has surpassed the allowed threshold for failed logins, it automatically adds that IP address to the system's /etc/hosts.deny file to block any further connection attempts.
Some key features of DenyHosts include:
- Easy installation and configuration on Linux/UNIX systems running OpenSSH
- Customizable threshold settings to fine tune blocking behavior
- Whitelisting of allowed IP addresses
- Synchronization across multiple servers to block IP addresses system-wide
- Logging and email alert capabilities
By leveraging DenyHosts to block access from IP addresses associated with too many failed SSH login attempts, administrators can significantly reduce malicious activity on their systems. It provides a simple yet effective extra layer of security on top of SSH for both small and large server deployments.
Denyhosts Features
Features
- Blocks IP addresses that make too many failed SSH login attempts
- Adds blocked IP addresses to /etc/hosts.deny file
- Open source program written in Python
- Works on Linux and Unix-based systems
- Configurable thresholds for blocking IPs
- Whitelist to prevent blocking valid users
- Daemon mode for continuous monitoring
- Email alerts when IPs are blocked
Pricing
- Open Source
Pros
Easy to install and configure
Effective at preventing brute force SSH attacks
Lightweight and low resource usage
Automatically blocks attackers without admin intervention
Open source with active development community
Cons
Can block valid users if thresholds are too low
Requires some Linux sysadmin knowledge to configure
Only protects SSH, not other services
Blocked IPs are not permanently banned
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