LSM: Linux Kernel Security Modules.
Inserts hooks at every point in the kernel where a user can conduct a system call to import kernel objects.
DAC: Discretionary Access Control : Default linux permissions MAC: Mandatory Access Control
Is an LSM that allows the user to restrict programs with the use of a profile specifiv to that application. These profiles are designed to delegate capabilities that include sockets, network access, file access and more.
Provides MAC on top of DAC
#: /boot/syslinux/syslinux.cfg APPEND apparmor=1 security=apparmor
Comes with sane defaults and have profiles for certain applications
- The Comprehensive Guide To AppArmor
Defines the access and transition rights of every user, application, process and file on the system.
- A process will perform an action request. (eg:to read a file)
- THe request is pushed to the SELinux security server
- The security server checks an Access Vector Cache (AVC) that stores subject and object permissions.
- If request not found therem it will consult the SELinux Policy Database.
- If the policy is found, It makes a decision of Yes or No for the access request.
- If yes, the object requested is returned. Else an AVC denied message is generated and the object is not returned
- Redhat: SELinux User's and Administrator's Guide
Uses linux namespaces in conjunction with seccomp-bpf to restrict the running enviornment of the application.
It comes with security profiles for a lot of applications in /etc/firejail.