I have restricted Firefox.deb Not the Snap from Documents and It dose ok. But this sounds to me as mistrust for users perhaps.
To prevent applications or commands executed in a shell from accessing certain directories, you can implement several strategies:
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Restricted Shell : Use a restricted shell like
rbashorlshell. A restricted shell limits the user’s ability to change directories, execute certain commands, and access files outside their home directory. For example, you can set up a restricted shell by setting the user’s shell to/bin/rbashand configuring thePATHto a directory containing only the allowed binaries and scripts.2 -
Filesystem Permissions : Utilize Linux filesystem permissions to control access to directories. You can set permissions on directories to restrict read, write, and execute access. For example, you can set the permissions of sensitive directories to be readable and executable only by specific users or groups.
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Mandatory Access Control (MAC) : Implement a MAC system like AppArmor or SELinux. These systems allow you to define policies that control which processes can access specific files and directories. For instance, you can set up an AppArmor profile for a user’s shell that restricts access to certain directories.
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Chroot Jails : Use
chrootto create a jailed environment where the user’s view of the filesystem is limited to a specific directory tree. This can prevent users from accessing directories outside the chroot environment. -
Groups and Permissions : Create groups and set the group ownership of executables to control who can run certain programs. For example, you can set the group of an executable to a specific group and add users to that group to grant them access.
By combining these methods, you can effectively restrict access to certain directories and commands, enhancing the security of your system.
Security is a 24/7/365 learning process.