Writing apparmor profiles

June 8, Last Updated: Profiles are then used to place limits on how applications interact with processes and files in the system.

Writing apparmor profiles

This man page describes the format of the AppArmor configuration files; see apparmor 7 for an overview of AppArmor. AppArmor configuration files are line-oriented; introduces a comment, similar to shell scripting languages. The exception to this rule is that include will include the contents of a file inline to the policy; this behaviour is modelled after cpp 1.

Embedded spaces or tabs must be quoted. Rules with embedded spaces or tabs must be quoted. There may be any number of subprofiles aka child profiles in a profile, limited only by kernel memory. Subprofile names are limited to characters. Child profiles can be used to confine an application in a special way, or when you want the child to be unconfined on the system, but confined when called from the parent.

Access Modes File permission access modes consists of combinations of the following modes: Read access is required for shell scripts and other interpreted content.

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Files and directories must have this permission if they are to be unlinked removed. Write mode is not required on a directory to rename or create files within the directory. This mode conflicts with append mode. The mode conflicts with Write mode. This mode is useful when a confined program needs to be able to perform a privileged operation, such as rebooting the machine.

By placing the privileged section in another executable and granting unconfined execution rights, it is possible to bypass the mandatory constraints imposed on all confined processes. For more information on what is constrained, see the apparmor 7 man page.

writing apparmor profiles

It enables the designated child processes to be run without any AppArmor protection. Any profile using this mode provides negligible security.

Use at your own risk. Incompatible with 'Ux', 'px', 'Px', 'cx', 'Cx', 'ix'. Use this mode only if the child absolutely must be run unconfined. Incompatible with 'ux', 'px', 'Px', 'cx', 'Cx', 'ix'.

If there is no profile defined then the access will be denied. Incompatible with 'Ux', 'ux', 'Px', 'cx', 'Cx', 'ix'. Incompatible with 'Ux', 'ux', 'px', 'cx', 'Cx', 'ix'. Incompatible with 'Ux', 'ux', 'px', 'Px', 'Cx', 'ix'. Incompatible with 'Ux', 'ux', 'px', 'Px', 'cx', 'ix'.

Instead, the executed resource will inherit the current profile. This mode is useful when a confined program needs to call another confined program without gaining the permissions of the target's profile, or losing the permissions of the current profile.

There is no version to scrub the environment because 'ix' executions don't change privileges. Incompatible with 'Ux', 'ux', 'Px', 'px', 'cx', 'Cx'. This flag marks the pages executable; it is used on some architectures to provide non- executable data pages, which can complicate exploit attempts.

When a link is created, the new link MUST have a subset of permissions as the original file with the exception that the destination does not have to have link access.

If there is an 'x' rule on the new link, it must match the original file exactly.AppArmor profiles describe mandatory access rights granted to given programs and are fed to the AppArmor policy enforcement module using apparmor_parser(8).

Understand the policies

This man page describes the format of the AppArmor configuration files; see apparmor (7) for an overview of AppArmor. Resources for writing profiles. The syntax for file globbing in AppArmor is a bit different than some other globbing implementations.

It is highly suggested you take a look at some of the below resources with regard to AppArmor profile syntax. Writing profiles for AppArmor by hand is important. There are some tools that can help: aa-genprof and aa-logprof can generate a profile for you and help with fine tuning it by running your application with AppArmor in complain mode.

The tools keep track of your application's activity and AppArmor. Writing AppArmor profiles.

writing apparmor profiles

Writing profiles for AppArmor by hand is important. There are some tools that can help: aa-genprof and aa-logprof can generate a profile for you and help with fine tuning it by running your application with AppArmor in complain mode.

audit { /foo r, network, } #include mechanism AppArmor provides an easy abstraction mechanism to group common file access requirements; this abstraction is an extremely flexible way to grant site-specific rights and makes writing new AppArmor profiles very simple by assembling the needed building blocks for any given program.

#include mechanism AppArmor provides an easy abstraction mechanism to group common file access requirements; this abstraction is an extremely flexible way to grant site-specific rights and makes writing new AppArmor profiles very simple by assembling the needed building blocks for any given program.

Attack Zero -- Information Security Blog: The "Other" Linux MAC Software: AppArmor