Allow only single aplication to access files on USB stick with Linux namespaces

Summary

– Use Linux namespaces to limit file access on a USB stick to one application at a time.
– Create a new namespace for each application that needs access to the USB stick.
– Set permissions and ownership of the mounted USB device within each namespace.
– Mount the USB stick in each namespace with appropriate options.
– Configure the applications to use the correct namespace when accessing files on the USB stick.

Introduction

– With the increasing prevalence of USB sticks, it is becoming more important to ensure that they are properly secured and restricted from unauthorized access. This can be achieved using Linux namespaces to limit file access to a single application at a time.

– Create Namespace
– The first step in creating a namespace is to create a new user namespace using the “new_user_namespace” command.
“`
sudo new_user_namespace
“`
– This will create a new user namespace and assign it to the current process.

– Set Permissions and Ownership
– Once the namespace has been created, set the permissions and ownership of the mounted USB device within each namespace.
“`
sudo chown root:root /dev/sdb1 # change ownership to root:root
sudo chmod 700 /dev/sdb1 # set permissions to rwx for owner
“`
– This ensures that only the root user has access to the USB device within the namespace.

– Mount USB Stick in Namespace
– Next, mount the USB stick in each namespace with appropriate options.
“`
sudo mount –rbind /mnt/usbstick /mnt/namespace/usbstick
“`
– This will create a new mount point within the namespace and bind it to the existing mount point on the USB stick.

– Configure Applications
– Finally, configure the applications to use the correct namespace when accessing files on the USB stick.
“`
sudo unshare -n –mount –fork # replace with the application name
“`
– This will run the application within the namespace and limit its access to only the files on the mounted USB device.

Conclusion

– Linux namespaces provide a powerful tool for securing USB sticks and limiting file access to single applications. By following these steps, you can ensure that your USB stick remains safe and secure from unauthorized access.

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