SSH (Secure Shell) is a network protocol that allows secure remote access to a machine over an unsecured network. It is commonly used by system administrators and developers to remotely manage and troubleshoot servers. In this article, we will discuss how to track SSH access on a client MacOS machine.
Tracking SSH access can be helpful in monitoring who has accessed your machine and when. It can also help in identifying any unauthorized access attempts or suspicious activities. There are several ways to track SSH access on a MacOS machine, and we will explore some of the common methods below.
1. Checking SSH Logs
SSH logs provide valuable information about SSH access on your machine. To view the SSH logs on a MacOS machine, follow these steps:
- Open the Terminal application on your Mac. You can find it in the Applications folder under Utilities.
- Once the Terminal is open, type the following command and press Enter:
sudo cat /var/log/system.log | grep sshd
This command will display the SSH logs containing information about SSH access attempts and successful logins. You may need to enter your administrator password to view the logs.
2. Using a Third-Party SSH Monitoring Tool
In addition to checking SSH logs, you can also use third-party SSH monitoring tools to track SSH access on your MacOS machine. These tools provide a more user-friendly interface and advanced features for monitoring SSH activity. Some popular SSH monitoring tools for MacOS include:
| Tool | Description |
|---|---|
| Fail2Ban | A log-parsing application that scans SSH logs and bans IP addresses with multiple failed login attempts. |
| OSSEC | An open-source host-based intrusion detection system that can monitor SSH logs and send alerts for suspicious activities. |
| Logcheck | A log management tool that monitors system logs, including SSH logs, and sends daily reports via email. |
These tools can be installed and configured according to their respective documentation to start tracking SSH access on your MacOS machine.
3. Enabling SSH Verbose Logging
Another method to track SSH access is by enabling verbose logging. When verbose logging is enabled, SSH will log detailed information about the connection attempts, including the IP address of the client machine. To enable verbose logging, follow these steps:
- Open the Terminal application on your Mac.
- Once the Terminal is open, type the following command and press Enter:
sudo nano /etc/ssh/sshd_config
This command will open the SSH server configuration file in the nano text editor.
- Scroll down to find the line that starts with
#LogLevel INFO. - Remove the
#symbol at the beginning of the line to uncomment it. - Change the log level to
VERBOSEby replacingINFOwithVERBOSE. The line should now look like:
LogLevel VERBOSE
- Press
Ctrl + Xto exit nano, then pressYto save the changes, and finally press Enter to confirm the file name. - Restart the SSH service by typing the following command and pressing Enter:
sudo launchctl stop com.openssh.sshd
With verbose logging enabled, SSH will now log detailed information about the SSH connections in the system log.
In conclusion, tracking SSH access on a client MacOS machine can be done by checking SSH logs, using third-party SSH monitoring tools, or enabling verbose logging. These methods can help you monitor and track SSH access to your machine, providing valuable insights into the security of your system.
References
| Source | Link |
|---|---|
| Fail2Ban | https://www.fail2ban.org/ |
| OSSEC | https://www.ossec.net/ |
| Logcheck | https://logcheck.alioth.debian.org/ |