Novell AppArmor profile components are called Novell AppArmor rules. Currently there are two main types of Novell AppArmor rules, path entries and capability entries. Path entries specify what the process can access in the file system and capability entries provide a more fine-grained control over what a confined process is allowed to do through other system calls that require privileges. Includes are a type of meta rule or directives that pull in path and capability entries from other files.

The easiest way of explaining what a profile consists of and how to create one is to show the details of a sample profile. Consider, for example, the following profile for the program /sbin/klogd:

# profile to confine klogd
/sbin/klogd 
{
#include <abstractions/base>
  capability sys_admin,
  /boot/* r,
  /proc/kmsg r,
  /sbin/klogd r,
  /var/run/klogd.pid lw,
}

	A comment naming the program that is confined by this profile. Always precede comments like this with the # sign.
	The absolute path to the program that is confined.
	The curly braces {} serve as a container for include statements of other profiles as well as for path and capability entries.
	This directive pulls in components of Novell AppArmor profiles to simplify profiles.
	Capability entry statements enable each of the 29 POSIX.1e draft capabilities.
	A path entry specifying what areas of the file system the program can access. The first part of a path entry specifies the absolute path of a file (including regular expression globbing) and the second part indicates permissible access modes (r for read, w for write, and x for execute). A white space of any kind (spaces or tabs) can precede pathnames or separate the pathname from the access modes. White space between the access mode and the trailing comma is optional.

When a profile is created for a program, the program can access only the files, modes, and POSIX capabilities specified in the profile. These restrictions are in addition to the native Linux access controls.

Example: .  To gain the capability CAP_CHOWN, the program must have both access to CAP_CHOWN under conventional Linux access controls (typically, be a root-owned process) and have capability chown in its profile. Similarly, to be able to write to the file /foo/bar the program must have both the correct user ID and mode bits set in the files attributes (see the chmod and chown man pages) and have /foo/bar w in its profile.

Attempts to violate Novell AppArmor rules are recorded in syslog. In many cases, Novell AppArmor rules prevent an attack from working because necessary files are not accessible and, in all cases, Novell AppArmor confinement restricts the damage that the attacker can do to the set of files permitted by Novell AppArmor.

#include statements are directives that pull in components of other Novell AppArmor profiles to simplify profiles. Include files fetch access permissions for programs. By using an include, you can give the program access to directory paths or files that are also required by other programs. Using includes can reduce the size of a profile.

By default, the #include statement appends /etc/apparmor.d/, which is where it expects to find the include file, to the beginning of the pathname. Unlike other profile statements (but similar to C programs), #include lines do not end with a comma.

To assist you in profiling your applications, Novell AppArmor provides two classes of #includes, abstractions, and program chunks.

Capabilities statements are simply the word “capability” followed by the name of the POSIX.1e capability as defined in the capabilities(7) man page.